Velcro
The product is good BUT the glue on the back of the product Stinks
Velcro: As far as I can tell the product it self is OK but the glue on the back side of the product is not strong enough for the product. I bought one box at a store and it did not hold up (glue on back side) to either my curtains or my tent. So then I went to another store and got a second box and ...