Squid Grips by Troy is a rail cover made of proprietary advanced rubber that is heat resistant and extremely durable. Will last for years to come. These Squid Grips are made specifically for the TRX Extreme, Alpha and Delta rails, and the covers mount directly into the cooling holes. The covers come in 6-hole configurations, but may be cut to form any length or inserted end to end for longer lengths. Each package of the Troy Squid Grips has 7 strips of rubber hole covers. Made in the U.S.A.