ERGON GC1 BIOKORK All the benefits of the GC1 grip forcyclists with backwards-swept bars. But combined with Ergon's bioKorktechnology. 195g per pair Why BioKork? The unique qualities of cork means thatit is antibacterial and hypoallergenic.Cork's natural damping qualities alsomake it an ideal grip material, and itslow density mean the resulting gripis a lot lighter. The bioKork grips use40% cork, sourced from sustainableforests in Portugal which is certifiedfor its ecologically sound production.This ecological theme is continuedthroughout the rest of the grip. Theinner core is plastic reinforced usingnatural fibre, which make up 40% of itsmass. in place of mineral oil, the gel inthe palm section of the grip is vegetableoil based. it is all a result of Ergon'sGreenLab initiative.