Thank you for the information, my mat has to be at least 25 yrs old, its one of the biggest ones, and I love it, besides I can't buy a new one, but its one of those things I don't want to part with, maybe I can get my son to soak outside for me, under some wet towles, I love my mat. I had no idea that the could wreak your blades. thats all I need is duler blades. God bless.