Made from 80 durometer medical grade silicone, Groove is the first and only active ring to be liquid poured. This means fine detail and perfect design with little to no mold marks or flaws.  Groove silicone is resistant to most common chemicals including gasoline, oil, diesel, & household cleaning products.  Groove is also non porous, non conductive, heat resistant, and hypoallergenic.

Groove Thin Specs: