Neo-Stretch Ballstretchers Fit And Feel Amazing. The Same Shape As Old-Style Neoprene Ballstretchers Same Thickness But Made Of Our Super-Soft Stretchy Silicone. It Wont Strangle Your Sack Wears Longer For More Stretch More Play... Neo-Stretch Keeps Those Nuts Down In Their Sack. All All Three Styles Have A Fat Lip Around The Edge So This One Will Not Dig Into Your Sack. Unlike Neoprene Neo-Stretch Is Rubbery Stretchy And Feels Like Its Part Of Your Sack... Neo-Stretch Short Fits Any Sack Even High-And-Tights. Safe With All Lubes This Toy Will Not Pinch Or Cause The Burning Feel Some Get Using Neoprene On Their Sack. And No Possibility Of Allergy Because This Is 100% Silicone?Neo Short Is A 1.25-Inch Shorter Ballstretcher That Will Fit Any Sack. Can Be Stacked As You Grow. All Are A Little Under 1 Inch Inside Diameter With A Slight Swell In The Center To Squeeze You More Where You Need It Most.