Product description this PP toilet seat fits for HOROW HR-0033/HR-0310/HR-0033S/HR-0033U toilet for future replacement. Please take it into consideration before purchasing it. Comparison between PP and UF seat: PP (polypropylene, thermoplastic) distinctive features: common plastic-unbreakable-soft closing seat descends slowly and quietly UF (urea-formaldehyde, thermoset) distinctive features: un-scratchable very easy to clean and longevity high-quality material and aesthetically looks like ceramic-descends slowly and quietly-hard, brittle and fragile conclusion the PP toilet seat can be closed slowly and quietly, which will not cause loud slamming or hand pinched. It also will not wake up your family with noise during sleeping time. Tap forward, then you can see the seat and cover closing slowly by themselves so that the user doesn't have to turn down the seat by bending. Made of high quality, environmentally friendly white polypropylene plastic, which does not fade, yellow, peel or crack over time; toilet seat is softer on sensitive body parts than painted wood, acrylic or other plastics.