UID Changeable M1 S50 Block 0 Writable CUID ISO 14443A 13.56 MHz Black Ring

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SKU: SF6047

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UID / CUID Black Ring

Don't like carrying your access card or key fob around? Copy the data to a ring and look great and never worry about forgetting your card or keyfob again! UID / CUID Changeable rings are used to duplicate Mifare Classic 1K access cards and keyfobs. These rings can be programmed with the Proxmark3, ACR122U or iCopy 3/8 devices.

IMPORTANT: There are two different types of rings that you can choose from:

Type 1: Normal GEN1 UID Changeable Rings:

  • All blocks (including Block 0) can be re-written multiple times  
  • Use ProxMark3 (Magic Chinese Guy function) or libnfc to change UID.
  • Uses "backdoor" technique to change/rewrite UID.
  • UID can be changed multiple times.
  • Not suitable for MCT on Android (Mifare Classic Tool)
  • Answers to Chinese magic backdoor commands (GEN 1a): YES 

Type 2: Special GEN2 CUID Tags:

  • All blocks (including Block 0) can be re-written multiple times  
  • Not easily detectable by a system with "anti-clone" feature
  • IMPORTANT: Fob will die if an invalid Block 0 is written
  • Use normal commands. eg. hf mf wrbl 0 B FFFFFFFFFFFF a473f601200804006263646566676869
  • Answers to Chinese magic backdoor commands: NO


  • Material: Zirconia Ceramic + Epoxy Resin 
  • Thickness: 2mm
  • Chip: UID or CUID (select above)
  • Frequency: 13.56 Mhz
  • Colour: Black
  • Induction Distance: 2-5cm
  • Waterproof: Yes

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