I have several sizes of the Q snap..The one I use the most is the 14 inch square. I have the floor model and several smaller sizes that I love too...I did find that after 11 years the snaps got a little looser, but I was able to replace them very cheaply by ordering the Q snap clamps. I had been told that you can use greenhouse clamps, but for me, they do not hold the fabric well at all..QSnap is well worth the investment, especially with a Joannes coupon!