Material: stainless steel, silicone and plastic. Inner diameter: 36mm. Gapless design, suitable for washbasin without drain hole, a useful tool for your home. Sturdy construction, sturdy rebound core with good rebound and strength for quick closing and one-touch drainage. The gasket is made of Made of high quality silicone, long service life, crack resistant, with stronger sealing performance. Perfectly designed to fit most bathroom sinks.