These genuine American nickels have been hollowed out then attached to bullet cufflink findings. Each have just enough room to hold a tiny Micro SD card. Instructions are included to open and close your secret compartment. Now you can wear yours as a fashionable accessory! Perfect for holding microdots, tiny bits of paper (with say, your encryption code or just some personal phone numbers), or for practical purposes, your micro SD cards with secret bank accounts or incriminating photos or videos.