This material is great for quick buildup and high strength projects. This material contains 17oz fiberglass woven at 45 degrees. On the backside a layer of 3/4oz fiberglass mat is also attached. This material offers strength in various directions and is great for many projects. Thickness is .044″. This material was made in the USA by Knytex, a respected manufacturer in the composite industry, and will ensure you receive quality material.