20/40 Pieces of High-Density Eva Foam Floor Mats (Black and Gray), with Interlocking Foam Panels - Non-Slip, Durable, Comfortable, Ideal for Gym Floors, Treadmills, Tatami Mats, Weight Rooms, Floor Protection Mats, Removable Pool Floors, and Pilates - Multi-Purpose Gym Flooring, Providing Extra Grip!