6mm aluminium and rubber laminated pad. This product is designed to be used with TL1 or TL2, offering heights of 16mm, 26mm, 36mm etc., which in some cases is a more cost effective solution than packing with 6 or more TL3 shims on every pedestal. The base of the pad is laminated with an aluminium layer, meaning there is no risk of reaction between the rubber and any waterproof membrane used beneath.