Moto Racing Grips (Pair Pierced ProGrip 717&nbsp;Blue Harder density against the bar to keep the grip from slipping and the soft gel density where needed. ProGrip was the first company that offered the duo compound handgrip. These grips are made by two different density rubber materials. This is what riders are looking for: hard material in the inner part of the grip to fix better on the bar without any problem of slippery and soft material for reduction of all vibrations that the motorcycle can transmit. Comfort and technology for your hands.