RFID Hotel Key Cards are manufactured to meet or exceed original manufacturers specifications. RFID top quality mifare 1K compatible chip cards are as reliable as they are superior. Plastic cards are litho-printed on a PCV card and laminated for long lasting service. Key Card Envelopes are sold separately. Thumb-out style holds & protects 2 Hotel keycards. Front of the envelope has area to write the room number, back has general safety rules.