Quantity and specifications: including 4 x Bounce Drain Filter.2 in 1 bathtub stopper and filter, washable, can prevent hair and valuables from leaking into the bathtub and prevent unnecessary blockage. High quality material: Made of high quality stainless steel + brass integrally cast and seamless, rust and corrosion resistant, durable and can be reused for a long time. Easy to install: Anyone can install a pop-up drain because of its simple construction, no tools required, the thickened and elongated nut allows it to be mounted by bare hands. Powerful functions: the basket can block dust, prevent hair blockage, and can effectively block and protect valuables from loss. Comfortable pressure switch, without clogging drainage. Size: It features two rebound cores, the closed height is 50mm, the lid width is 35mm, and the strainer basket diameter is 31.5mm. (Please measure the diameter of the sink before purchasing!!!)