Neoprene chainstay protector ride with minimal chain slap by using a chainstay protector designed and made in the lizard skin utah facility the chainstay protector is made with neoprene and sewn with a tight stitch and heavy duty thread for extra strength and durability lizard skins chainstay guards are the original strongest and lightest protectors on the market since 1993 large fits circumference of 125 140mm medium fits circumference of 100 125mm