This item is manufactured with for durable and use. You need to install them with proper tools like needle nose pliers and face hammers. After installation, This product can be used to increase the height of the sofa. Features - Color: Assorted Color. - Material: PTFE. - Multi-function, anti-slip, prevent from marring and scratches,reduces friction vibration and noise while moving furniture chairs tables and lengthen the life of them and floor. - Advantages: Lasts far longer than stick-on pads and easier replacement.It absorbs shocks for extra bumper pad. - Easy use: Easily mounted onto bottom of wooden furniture chairs tables by gentle hammering. - sturdy metal nail, high duty nylon pad. The nail was integrated into nylon pad, which ensures longevity, durability and . - You'd better pre-drill hole for hardwood to prevent nails from bending, or furniture feet from cracking damage. Package list: Furniture Glides