Brought the chair pad home. Seemed OK but then I realized that not having a beveled edge is really important. If chair travels beyond the pad wheels can not negotiate the straight lip in order to get back onto pad. Have to lift the wheels over. Quite a pain in the neck. Also wheels make a fairly deep depression in the pad and chair does not roll easily. Should have purchased a better quality pad however store display only had strait edges in all price ranges. Will keep this one for a while but definitely will have to upgrade sometime in the future.
I bought this mat to replace a similar one that disintegrated after about five years. I should have bought one with little pegs on the bottom to prevent it from sliding around on the carpet. Now I have to adjust it every day after it has shifted around. My mistake. It does the job allowing my chair to move easily over the carpet.