The Penrith Silentium STA-TITE Top Fix is designed for universal pans and is made from durable, Tecnoplast thermoplastic material. The seat features slow close hinges that close slowly and silently preventing slamming and pinched fingers. This seat stays tight with STA-TITE Top Fix: the patented fixing system that keeps your seat tight and installs easily from the top of the pan. No more loose seats!