Tenderfoot Stall Mat | Rubber Flooring | Perfect Surfaces
Amazon.com: Interlocking Rubber Mat Flooring 4' x 6' x 3/4" for Gym or Equine Stall, Heaviest Duty, Indestructible, Non-Slip, Smooth or Diamond Surface - The Standard (3/4" Thick, Interlocking Diamond Plate) :
Wash Mats Interlocking Mats with Holes 3' x 3' x 1/2" - Cashmans