Freeman Gasket Material, neoprene, .56" x .55" x .44". Standard Freeman hatch gasket material. It measures a top width of .56", bottom width of .44" and a height of .55". It is made of neoprene and has a durometer rating of 25. This gasket provides a secure seal, protecting closures from the onslaught of elements in the demanding marine environment. Sold by the foot.