NEO-FIRM ballstretchers are revolutionary…the same shape as old-style neoprene ball-stretchers, same thickness, but made of a new pressure cast silicone hybrid with firm grip and the same stretch as a neoprene ballstretcher…it has neoprene fibers in it that gives a firm grip but it feels better than old-school neoprene... IF YOU LIKE A SOFTER STRETCHIER "SQUISHIER" BALLSTRETCHER, CHECK OUT NEO-STRETCH NEO-FIRM's grippy stretch really keeps those nuts down in their sack...but unlike neoprene, NEO does not lose its shape and grow bigger over time…after all, you want your sack to grow bigger, not the toy stretching it. Safe with all lubes, this toy will not pinch or cause a burning feel some get using neoprene on their sack, and no possibility of allergy because this is 90% silicone…