Nice Noise Reduction Effect: this door slam stopper is designed for metal frame doors, which can play the role of anti collision and noise reduction, avoiding clicks and closing sounds, bringing you a quiet environmentGood Elasticity and High Temperature Resistance: the door slam silencer is mainly made of quality silicone rubber, safe and sturdy, with high temperature resistance, good elasticity, high strength, no odor and no deformation, serving you for a long timeEasy to Apply: first lubricate the door silencer with grease or soap, insert the tip of the cone into the hole on the door with a small metal rod, screwdriver or other tools to assist you to insert the hole from the side, simple and fastAppropriate Size: the rubber door bumper is measured about 12 mm/ 0.47 inch in bottom outer diameter, the diameter of the upper cone is about 8 mm/ 0.31 inch, the card height is about 2.5 mm/ 0.098 inch; Please confirm the size before placing an order to avoid unpleasant shopping experienceSufficient Quantity to Use: there are 200 pieces of metal door silencers in the package, which are sufficient to meet your daily needs; In addition, the small size will not take up too much storage space, and the use of the door will not affect the overall appearance Features: Where to place: The door slamming silencer provides a quiet environment for infants or adults and is ideal for use in nurseries, schools, libraries, day spas, as well as nap time and nighttime homes. Practical presents: Featuring rubber material and gray color, the metal door silencer is safe, practical and matchable, so you can give it as a gift to friends, colleagues, relatives, family, showing your love and care. Specifications: Main color: gray Main material: rubber Size: Bottom outer diameter: about 12 mm/ 0.47 inch Upper cone diameter: about 8 mm/ 0.31 inch The card height: about 2.5 mm/ 0.098 inch Package includes: 200 x Silencers for metal door Warm notes: Due to manual measurement, there may be slight size errors. Please confirm the size before placing an order to avoid unpleasant shopping experience. Small parts are included, please keep away from kids.