Materical : ABS + Metal Size: S/M/L Applications : for 2.6~3.5cm holes/ for 3.6~4.2cm holes /for 4.2~5cm holes Easy to install, plug and play. Features:Anti odor/ Anti defection/ Fast drainage/Insect Prevention Automatic opening when draining, closing after draining. Applicable: Widely used for Pipes Tubes in Toilet, Bathroom, Kitchen , Floor and more. Working Principle: (1)When the water into the ground drain, the gravity of the water will open the bottom of the ABS gasket, dripping unimpeded. (2) After disruption of water, ASB gasket is automatically closed due to gravity.Completely sealed so that the gas in the pipeline, pests and over flow can not be up. Package Included: 5Pcs/set * floor drain core Note:1.The filter cover can be removed if you not needed.(note:filter cover send random) 2. Some dimensional errors occur due to the need for manual measurements. 3. Due to the difference between the different displays, the picture may not reflect the actual color of the item.