ESI Grips Chunky Silicone grips are recommended for grip shift bars and for riders looking for the best shock absorbing grip. ESI Grips Chunky Silicone grips are recommended for grip shift bars and for riders looking for the best shock absorbing grip. ESI's silicone grips and end caps do not contain any natural rubber or natural latex in their components or ingredients. These race proven lightweight grips are used by cyclists around the world - from every day riders to Olympians. The best materials and the best production processes creates maximum shock absorption and grip while maintaining the lowest possible weight and the highest level of durability. No tread patterns or logos needed! Silicone has a memory; with ESI grips you will create a custom mould of your hand for a no slip ride every time.