The Ergon GP4 grips use corners with space for the whole palm, which brings additional grip positions and better stability when climbing. The angle of the corners can be adjusted independently of the grip angle for a perfect fit. The clamp fixes the grip in place and prevents it from moving while driving. Grips effectively counteract hand numbness, finger pain and forearm fatigue. the special certified material developed in Germany guarantees top quality.grips are compatible with carbon handlebars. Material: Certified rubber compound Sleeve: Composite fiberglass with rubber inserts Weight: 320 g Use: MTB, travel, commuting