Bought as a gift.  A good friend and I bought several of these on an Alaskan cruise.  I still have mine.  He wore his out or lost them.  Wanted more so I got these.  They are not cheap and appear durable.  I tried a pack of a dozen, mixed colors, from a different maker (cheaper unit cost) but threw them away.  They were flimsy, would not flex open as needed...just not usable for their intended purpose.  These black ones work as well as any I've tried.