This headboard stopper is made of , which can withstand use. Features the alloy, rubber, EVA material, which has high durability, not easy to deform. Fine workmanship, ensures practicality. This headboard stopper will make the repair and fix easier and smoother. Features - Material: Alloy, rubber, EVA. - Size: About 4.00X3.80X3.80cm/1.57X1.49X1.49inch. - Adjustable range: 30mm-40mm. - The bed headboard stoppers anti-shake tools can provide support for bed frames, making your bed not easy to noises. - They can also be applied to cabinet, table, book shelves, sofa and other items which against the wall. - The bed frame anti-shake tool can reduce the noise caused by the unstable structure of the bed or other furniture. - Will give you a quiet and comfortable home environment, and enjoy your life! - Suitable for bedrooms, living rooms, apartments, hotels, etc. It's easy to install and operate. Package list: 4 x bedside stabilizers 4 patch 4 x double-sided adhesive patch