Wow, do I feel like I'm a bit behind ya'll here! LoL
I have 2 but can only use 1 as my lovely dad left one out in the sun during a move and it got all bubbly in the center of it. I need to cut it down to just the usuable parts, that would give me some smaller ones. Both are 24x36 self-healing. The one I do use is double sided and I do flip it over from time-to-time just for a change of color. :-)