Will eliminate noise from sliding chairs (teachers love it!) and keep floors clean from scratching marring and damaging vinyl floor surfaces. Made from unbreakable polycarbonate material (Lexan) it is a permanent fit on the rail. For use on smooth hard floors and on tile floors or rough floors in kitchens or cafeterias. These felt base sled base glides protect your floor from marks or scratches. These glides are 2" in length and made from durable molded plastic with felt bases and will snap around sled base legs. Manufactured with peel and stick felt pads. Replacement pads are also available for purchase.