Clarks Lock-On grips are constructed with a polypropylene inner sleeve coated with thermo plastic rubber to provide a hard wearing and positive feel. Aluminium locking rings then secure firmly to the handle bar preventing any rotational movement of the grip. 
Product information
Comfortable Main Body: The ergonomic design provides superior comfort, supporting your hands and reducing fatigue during long rides. At 130mm, these grips offer ample coverage for a variety of handlebars.
Ergonomic 130mm Long black rubber grip with raised palm support