Great little rings--they're strong and do the job. I've bought them twice to attach to my small Sandisk Micro USBs. Amazingly, even the 64 GB is so tiny that it barely protrudes from my notebook's USB port, so I leave 3 of them in my computer at all times--almost 200 GB more of data that I can easily transfer to other devices. But they're so tiny that I've lost a couple after removing them--hence these little straps.