The insert

Gravity Drive™
insert

The Gravity Drive™ Insert uses advanced elasticity principles to generate more consistent putts. Our patented design combines an exotic thermoplastic, polyphenylsulfone (PPSU), with precision-milled 303 stainless steel for unmatched performance.

The PPSU insert is engineered to gradually increase in thickness towards the edges. This unique design adds more kinetic energy on impact, compensating for the distance normally lost on heel or toe strikes.

Material Testing

In a controlled test, a golf ball was dropped from 15 inches above increasing thickness samples of insert material. The images below overlay 10 tests for each thickness, showing the average rebound height. The rebound height was used to calculate rebound velocity and kinetic energy.

Five drop-test frames side by side, labelled 0 to 4 on yellow sticky notes, each overlaying ten golf ball rebounds against a steel rule so the average rebound height for that insert thickness is visible as a band.
  • Label 0: Steel face (base rebound energy .146J)
  • Label 1: 1/8'' Thermoplastic/ .147J
  • Label 2: 1/4'' Thermoplastic/ .148J
  • Label 3: 3/8'' Thermoplastic/ .149J
  • Label 4: 1/2'' Thermoplastic/ .151J

Kinetic energy post impact can be seen increasing with insert thickness representing a max energy conservation of 3% when compared to initial impact speed.

Steel Control Kinetic Energy

  1. Using the formula for kinetic energy: K.E.=12m v2
  2. Substitute m = 0.045 kg and v = 2.545 m/s: K.E.=12(0.045)(2.545)2
  3. K.E.=0.146 J

1/2 Inch Thermoplastic Kinetic Energy

  1. Using the formula for kinetic energy: K.E.=12m v2
  2. Substitute m = 0.045 kg and v = 2.5933 m/s: K.E.=12(0.045)(2.5933)2
  3. K.E.=0.151 J

The problem

How does
this help?

When a putt strikes the heel or toe of a traditional putter, the ball won’t travel as far. This happens because the ball moves away from the center of mass, causing the putter head to twist and reducing ball speed. With a sweet spot about the size of a quarter, these mishits are easy to make but hard to overcome.

Gravity Drive™ Technology expands the sweet spot across the entire insert by adding kinetic energy to the heel and toe of the club face. By redistributing energy towards the heel and toe, we generate consistent roll distances, even on off-center strikes. The result? More consistent putts and fewer surprises on the greens.

On the green

What does this mean
on the green?

Our insert is designed to remove inconsistencies when putting from 15-20 feet—the critical range for birdies and par saves.

Real-World Impact

A tour pro will miss roughly 4-5 putts from 15 feet. However, they are much more likely to be in “gimme” range for the following putt. This is the key to avoiding 3-putts. Our high MOI designs paired with the Gravity Drive insert helps heel and toe hits roll out the intended distance. This gives poor strikes a chance and it prevents the golfer from overcompensating and hitting the ball too hard on follow up putts.

Closer misses are key. PGA putts made from 3 feet, 99%. PGA putts made from 6 feet, 70%. Lag putting is crucial.

By precision milling the PPSU insert to increase thickness toward the edges, we create uniform roll distances across the entire striking area.

A player crouched on the green placing a ball in front of a blue Void putter, framed at grass level.

The chassis

Maximum MOI for
ultimate forgiveness

A billet aluminum bar, a CNC end mill in its tool holder, and two finished putter chassis lit against black.

Our putters feature up to 170 grams of tungsten precision-assembled in a machine-milled aluminum chassis. This combination is engineered to deliver maximum MOI (moment of inertia)—a critical factor in maintaining stability and accuracy.

What is MOI?

MOI measures an object’s resistance to twisting. When a ball is struck off-center, the putter tends to twist in your hands, reducing accuracy and roll distance. By strategically adding weight to the heel and toe, we significantly increase the putter’s resistance to twisting, minimizing the negative effects of mishits.

Innovative Design

Using lightweight billet aluminum allows us to position up to 50% of the putter’s weight toward the perimeter, maximizing MOI without compromising balance. Paired with the Gravity Drive™ Insert, this design creates one of the most forgiving putters on the market.

Every Void Putter is CNC-milled, hand-finished, and assembled with care in San Diego, California.

Swing arm test

Watch our swing arm test to see the Gravity Drive™ insert in action. Experience how it delivers consistent results across the entire face of the putter.

Build it

Configure your custom Void putter today and experience the difference of Gravity Drive™ technology.

Build Yours Now