These innovative ball knobs have a durable thermoplastic core but are covered with an outer skin of rubberized TPE. The result is an attractive knob with a user-friendly soft feel. The TPE also has a tacky, positive grip for safe, sure handling. Perfect for a wide variety of gripping and shift applications where ergonomics and quality are important. Metric and locking inserts are also standard. Insert materials include steel, brass, stainless and aluminum.