and they do.... but i chose felt for several reasons, it is 6' wide and inexpensive, comes in lots of nice colors and it not only holds the blocks as well, but when it begins to flatten and get 'more slippery' and start to lose the blocks, take a large scrub brush and brush well.... the nap comes back up and is 'new' again... (like once a year, not that often).... and you will be happier if you do this with your flannel, too, if you decide to go that way...