ES Robbins 120123 45 x 53 Lip Chair Mat, Task Series AnchorBar for Carpet up to 1/4" Protects low pile or commercial carpets up to 1/4" thick including padding High quality, task chair mat ideal for home and light office applications Exclusive AnchorBar chair mat cleats hold firmly in place yet are gentle on carpet and fingers Straight edge Protects against wear and tear from chair casters