This pad can be used over hard wood floors or low level loop carpet depending which side you use. One side is rubber that breathes will not discolor floors, the other side is a precompressed non allergenic felt. Will not mat down even under heavy furniture. Available standard sizes 2x4, 3x5 ,4x6, 5x8, 6x9, 8x10, 8x11, 9x12, 10x14, 3x10, & 2x12 call a head and for in store stock ( we try to keep a 12' roll in stock), orders in seven to 10 days days. Custom sizes and shapes are sold by the square foot call or e mail for pricing.