Selling a very nice glass chair mat for any surface 42" x 36". Keep in mind you'lI never have to purchase another cheap plastic mat that keeps bowing and cracking over time. I originally purchased this from Vitrazza for $250 with the following specifications:
Actual Size: 36" x 42" x 1/4" thick
Weight: 32.6 lbs.
Tested to hold over 1000 lbs.