either the rubber shelf stuff or the large spaced rug liner. I prefer the rug liner. You can buy 6 inches at Joanns and it will only cost you $2.50 (much less with coupon). Since it is 54" wide, I can use the extra pieces under plants and vases. I keep a smallish square with my baking bowls and use it under a bowl that I am hand beating (no sliding around).