This mat is designed exclusively for low-pile and flat-pile carpets up to 1/4 inch thick, is not suitable for hard floors, high-pile, uneven rugs. shipping, it is rolled unroll it and allow time to flatten, applying gentle pressure can help it settle smoothly. It features extended under-desk coverage with a wider lip for extra protection under desk edges and along chair movement zones. The reinforced surface supports smooth chair rolling without sinking or leaving deep indentations, protecting carpets from wheel marks, snags, daily wear, making it ideal for home offices, gaming setups, workstations. Available colors: 2 pcs 36"" x 48"" (for low-pile carpet), 30"" x 48"" (for low-pile carpet), 36"" x 36"" Round (for low-pile carpet), 36"" x 48"" Black (for low-pile carpet), 36"" x 48"" Convex (for hard floors), 36"" x 48"" Convex (for low-pile carpet)