Package Content: You will receive 8pcs 3d printer silicon bed mounts with 2 sizes. 4pcs are 16mm in height and 4pcs are 18mm in height. Enough for your daily needs in replacing the springs under heat bed. Product Size: The outer diameter: 16mm / 0.63inch; the inner diameter: 4mm / 0.16inch; the height: 18mm / 0.71inch and 16mm / 0.63inch. Proper size to help level your 3d printers more easily. Premium Material: These 3d printer solid bed mounts are made of quality silicone, flexible, heat resistant, wear resistant and durable. They help reduce the vibration during 3D printer working. You can use them with confidence. Excellent Performance: Better than general springs, these 3d printer solid silicone columns have larger contact surfaces with your 3D printer, and can help reduce the vibration a lot when it works and make the printing clearer. Wide Application: Because of the simple installation, the 3d printer silicone columns can be used more easily, and suitable for most models of 3D printers. Silicone material makes them become a perfect buffer and keep the 3D printers in the same level for a long time.