THESE MATS DON'T STICKY ENOUGH, VERY LONG.  THAT IS WHY WHEN I SAW THE BULK SALE ON THEM, I JUMPED ON IT.  I HAVE BEEN USING THESE MATS FOR 4 YEARS.  I WISH THERE WAS SOMETHING THAT I COULD DO TO MAKE THEM LAST LONGER.  I'VE GONE ON YOUTUBE AND FOUND THE HACKS FOR CLEANING THEM, BUT HAVEN'T USED ANY BECAUSE I DON'T WANT TO MAKE IT EVEN LESS STICKY.