Carrara and Matta York STA-TITE slow close silentium toilet seat is designed for universal pans and is made from durable, tecnoplast thermoplastic material. This seat features durable plastic hinges that adjust to help achieve the perfect fit to the pan. this seat features STA-TITE and the patented fixing system that always stays tight and takes the guesswork out of installation. the lower portion of the nut shears off when the proper tightness is reached so it cannot over-tighten.