Standard 125kHz EM4100 RFID cards in packs of ten. You cannot write to these cards.
Using the options menu you can select between thin or thick cards. Thin cards are 0.8mm in thickness. Thick cards are 1.6mm in thickness with a cutout to allow for addition to an ID card loop.
This is a brand-new, old-stock item that has been in storage. Full warranty and technical support. Click here to learn more.