The Ergon GP5 grips use curved corners with space for the whole palm, which brings additional grip positions and better stability when climbing. GP5s are a great choice for longer journeys. 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. BioKork grips are made from 40% cork and take advantage of its unique properties. The grips are antibacterial, hypoallergenic and the cork has natural cushioning properties. The cork comes from sustainable forests in Portugal and is certified for its organic production. The ecological processing accompanies the entire production of the grip.the inner core is made of reinforced plastic using natural fibres, which make up 20% of its weight. Material: cork, Certified rubber compound Sleeve: Composite fiberglass with rubber inserts Weight: 395 g Use: MTB, travel, commuting