CANE CREEK G4 THUDBUSTER ELASTOMERSOFTENING THE BLOWWe're not against rides, we're not against riders, but we are against those thuds. The Thudbuster seatpost is a suspension seatpost that relies on an elastomer to soften the blows of the bumps in the road or trail. Depending on your weight, you can choose a different elastomer to make the Thudbuster firmer or softer. The Cane Creek G4 Thudbuster Elastomer comes in different firmness levels from extra soft to extra firm. Features Designed for the G4 Thudbuster Comes in 5 firmness levels from extra soft to extra firm | Cane Creek | G4 Thudbuster Elastomer X-Firm