Made of Zinc Alloy Material for Long Durability, Sufficient Hardness and Corrosion Resistance. Sturdy Spring Holds the Stop in the Up Position Firmly Soft Rubber Foot for Good Holding Power. There is No Need to Bend Over, Simply Kick Down It by Foot. Works on any Surface Carpet,Wood, Cement,Stone Linoleum, Tiles Door Stopper will Prevent Your Door from Moving, Reduce the Noise while Closing Door.Easy to Install to the Door with Screws, Application & Release by Foot Package includes: 1 x 4" Door Stopper + 3 screws HOME&I Kickdown Door Stopper,4-Inch Door Holder Kick Door Kickstand Rubber Foot