Golfer putting with the String Theory putting trainer on a practice green
String Theory putter head detail showing where the string meets the head
String Theory putting trainer mid-stroke on the green with the string shaft taut
String Theory putting trainer beside a golf bag
Patented putting trainer

String Theory Putting Trainer – Men’s 35"

$129.00

Length

Men’s 35" $129 Women’s 32" $122 Junior's 30" $115
Handedness

Free US shipping · Ships in 3–5 business days from Maryland · 30-day returns · Returns

  • Patented weighted-string shaft · US Patent #10,857,443
  • Hit real putts on the carpet or the practice green
  • No batteries, no app. 15 seconds of prep, then putt. Stows in your bag
Details

A putting stroke you can't fake. The patented weighted-string shaft only swings cleanly when you make a true pendulum stroke. Let your hands take over, decelerate, or jab at the ball, and you feel it instantly.

Most golfers get the feel within 10–15 minutes. After that, a few minutes a day builds a rhythm you can trust.

  • 35" men's length, right- or left-handed
  • US Patent #10,857,443
  • Featured in the Inventor's Spotlight at the 2025 PGA Show
What golfers and coaches say

Verified buyers and PGA professionals

“A fabulous tool to teach with and to learn how to develop a putting stroke with tempo. It is terrific for learning a passive transition from the backstroke to the forward stroke while maintaining a consistent speed with the putter head.”
— George Pinnell, PGA

This thing will not lie

I was so skeptical when I opened the package. I always knew my hands were a problem, especially in transition. I’ve done the sticks under the armpits, tied together under the hands, and you can fake that. The String Theory did it. Grip pressure and, most importantly, how it feels at transition. This thing will not lie, and it translates easily to a regular setup with a regular putter.
Steve Z.

A calm, controlled cadence

I asked the best putter I know how to get better at lag putting; he said, “look up String Theory Putting.” This aid is exactly what I needed. Teaches you to use your shoulders to create a calm and controlled cadence for your putting stroke. Also a nice reminder on tempo for your full swing.
Crosley J.

Takes the hands out of it

One of the best training aids on the market. To putt well, you have to prevent your hands from taking over the stroke. This device cures this common putting fault.
Jerry R.

A coach’s view

This is a great teaching tool. I really like watching my students use this and watching the feedback they get from their putting stroke.
Chris A., PGA Professional

Tempo and feel

Great for dialing in tempo and feel.
Nick B.

Bought as a gift

Great gift for the golf lover in your family! My dad has been using this weekly and is rethinking his approach to putting. Early returns are fantastic and his short game is only improving.
Chari B.

Already seeing improvement

The product is high quality and we are already seeing improvement in our short game. Customer service was top notch and the putter was delivered in a timely fashion. Highly recommend!
Max B.

Lots of feedback

Great product with a lot of feedback when using it.
Antonia M.

Immediate

Helped my putting immediately!
Thomas R.

Confidence on every putt

I feel I have confidence with every putt and my putting stats have shown marked improvement.
Niche Golf
Before you buy

Still deciding?

Still unsure? Talk to Ben, the inventor: Ben@stringtheorygolf.com or (929) 443-9738.

How is this different from gates, mirrors and rails?

Those show you where the putt went after the fact. String Theory reacts during the stroke: the moment your hands push, jab or flip, the string goes slack and the head collapses, so you feel the fault and fix it on the next one.

How long does it take to learn?

Most golfers find the motion in one 10–15 minute session. After that, five minutes before a round or a practice session is enough to groove your tempo.

Can I hit real balls with it?

Yes. It isn’t a real putter, it’s a training aid that lets you hit putts as if it were one. Use it on the carpet, the practice green or while warming up, on putts inside about 10 feet.

Do I have to change my stance or setup?

Only while you use the String Theory: stand a touch closer so the string hangs straight down from your hands. Back with your regular putter, take your normal stance and the feel of the swing transfers without you thinking about it. String Theory plus a closer stance builds the skill. Your regular putter plus your normal stance is where it pays off.

Can I hit long putts with it?

It isn’t really meant for long putts. Anything inside 10 feet is the distance to work on your stroke. When you go back to your regular putter, long putts feel easier too, because the feel of a true stroke stays with you.

I use a mallet, a heel-shafted or a long putter. Does that matter?

No. You’re building the feel of rhythm in your stroke, and that feel doesn’t change with the style of putter. Train with the String Theory and putt with any putter you prefer.

Which length should I choose?

Pick the length closest to your current putter: 35" men’s, 32" women’s, or 30" junior. Every length comes in right- and left-handed.

How much is shipping, and how fast?

Shipping is free on all US orders. Orders are processed and fulfilled within 3–5 business days from our warehouse in Maryland. We also ship internationally; international buyers pay any duties and import taxes to customs when the package arrives.

What if it isn’t for me?

Use it for 30 days. If it isn’t helping your stroke, email ben@stringtheorygolf.com to start a return, and we’ll refund you in full. Return shipping is paid by the customer, and the 30-day return applies to US orders. Tried it on the carpet or the course? That’s fine. No tags or original packaging required.

Five minutes a day.A stroke you can trust.

Get your trainer — $129