content: These are handy for all sorts of headphones, not just for the earbuds that will store in the holes. They are made of softer, more flexible material than the Sumajin Smartwraps and seem a bit more secure. I have several sets of headphones which offer varying degrees of sound isolation, and so I have equipped them all with these handy little reels. Not a big deal, but it does make controlling the extra cord length simple.