https://www.ebay.com/sch/i.html?_nkw=3M+Silver+Endothermic+Mat&_sacat=0&_dmd=2

3M Silver Endothermic Mat

Regular price
$988.00
Sale price
$731.00

Firestop Mat, Width 24-1/2 In, Length 20 ft, Cable Trays, Cables, Ducts, Metal Pipe, Plastic Pipe, Structural Steel, Up to 2 hr. Fire Rating, Silver, Material Endothermic