RFID Keyfob tags are becoming increasingly popular for Access Control since these tags also provide the dual function of being a "Key Chain" for your own keys such vehicle, home, office, and other types.
This entire web page is devoted to Low Frequency 125 kHz and High Frequency 13.56 MHz Keyfob tags.  All of the following keyfobs, keychains or keyholders can be equipped with these 125 kHz or 13.56 MHz Integrated Circuits:

RFID key fob is a more convenient and fashion solution for the access control/ staff identification applications. They are made of durable ABS or PC material. The housing is finished by Ultrasonic plastic welding, which makes the keyfob water and dust proof.
Waterproof, durable, and fashion shape Flexible usage, like for room key,ID cards, access control
The key fob are available with broad range of RFID technology, from low frequency to ultra high frequency, thus it provid an optimal solution for different RFID applications.
LF:TK4100, EM4200, EM4305,T5577, ect.
HF:Mifare 1k, Mifare 4k, I-Code2, Ultralight, Ultralight C, NTAG203, ect.
UHF:Alien H3, ect.
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Wholesale RFID key tags