The tacky, gel-like surface compound provides the ultimate in traction and comfort, while the firm inner core ensures that the grip stands the test of time. Constructed from both firm and soft Kraton rubber compounds. Tacky outer casing provides excellen Single-Density Grips: The Single Density grip is the most versatile in ProTaper's lineup. Exclusive Kraton rubber compound provides maximum durability and comfort. Half Waffle traction pattern. MX flange style. Dual-Density Grips: Dual Density grips incorporate two dedicated synthetic rubber compounds.