Plastic Flooring
Rubber-Cal, Inc. "Block-Grip" 4" ft. x 9" ft. Garage Flooring Roll in Dark gray | 4" ft. x 4" ft | Wayfair 03-211-DG-04 - Multi Color (4" ft. x 4" ft)
Amazon
Rubber-Cal Block-Grip Rubber Runner Mat - 2mm x 4ft x 4ft Rubber Rolls - Dark Gray