The Chester is Race Face's softest, stickiest and most advanced grip, developed based on feedback from riders and racers.the perforated 20A Durometer grip core design increases ride comfort and reduces fatigue. In addition, the angled sponge ribs wick away hand moisture when riding without gloves and increase a secure grip. Anodised grip sleeves in different colours give you the opportunity to fine-tune your bike. Diameter: 31mm, 34mm Material: 20A Durometer Rubber Length: 136mm Weight: 112g (31mm pair), 135g (34mm pair)