Just think of it like a new and improved version of your old rubber bands, Q Knot PRO is a reusable multipurpose tie for just about anything: bundling small tool and gadget, organizing various cords (i.e. your computer, portable electronics, tools, Christmas lights, small appliances), and much more. Just strap and done with self locking design that can reuse again. Q Knot is made of a stretchable and flexible rubber that will seal plastic bags better than a bag clip. The non-slip gripping "teeth" design of Q Knot will reinforce the tightness around bag. The new "Pro" version features slanted triangular teeth that are designed for tighter locking. Q Knot is also reusable: easy release and retie. Say good bye to the plastic cable ties which is only one time use and create more waste, which is environmental unfriendly and against the "go green" campaign around the world. Each re-sealable bag of 12 count Q Knots Pro comes in 3 different colors (Wintergreen/White/Black) and 3 sizes (4-1/2-inch, 6-inch, and 7-inch long) in each bag for your different needs. Great gadget for your garage, electrical,home garden and camping.