4 Pack. The SwirlyHook headphone holder was designed to fit on 1/2-inch tubing (which is about the size of a dime) and fits snuggly, using only friction and gravity, on a standard mic stand. The SwirlyHook is the perfect spot to put headphones, tambourines or cables. The hook portion is about 2 1/2 inches long so it's plenty big to hold what needs holding! It's made out of sturdy and resilient steel then coated with a black PVC coating for grip, durability and protection. Try them on mic stands, shelving, drum hardware, bird feeders or any 1/2-inch vertical tubing.