M100 Rub Rail (Rubber Edge Trim). Used in Vac-U-Tug and Vac-U-Tow kits. Great for opening trim for .060" to .080" material. 
M200 Bulk Rub Rail (Rubber Edge Trim). Smaller than the M100 used with the Tug and Towboat kits. Great for opening trim for .030" to .050" material. 

Rubber Edge Trim is a highly flexible film made
of a dense neoprene rubber compound.