Doorstops, [pack Of 4] Transparent Doorstops And Stoppers Adhesive Door Stopper Non-Slip Design: The door stops are made of soft silicone, designed with a grooved bottom surface, to hold doors firmly in place and prevent them from sliding or sliding shut Height Adjustable: 4 door stops can be stacked together to accommodate maximum gaps of up to 66mm, 1 door stopper could at minimum gaps of 2mm. Universal application: excellent adhesion on smooth floors such as hard floors, tiles, laminate and parquet, suitable for all types of doors and also furniture in the kitchen, bathroom, living room and children's room .