Ergon GP1 BioKork Gripshift Lock-On Grips Small CorkThe Ergon GP1 BioKork Gripshift Lock-On Grips are made from 40% cork, sourced from sustainable forests in Portugal. This green, sustainable theme is echoed throughout the complete construction of the grip with an inner core made of a reinforced plastic utilizing natural fibers which makes up 20% of its mass. These grips are Carbon bar compatible. Weight only 195g. Available in Small and Large.4260477061157