These staffs store all data around it then in computers to process. There are several classes: 

  • Class I: These are 32.1 mm long and 4.3 mm in the diameter. These are the smallest. 
  • Class II: These are 62.6 mm long and 10.0 mm in the diameter. These are used in PADDs. 
  • Class III: These are 95.2 mm long and 12.7 mm in the diameter. These are used in consoles. 
  • Class IV: These are 319.6 mm long and 74.3 mm in the diameter. These are used in computer cores. 

These staffs are coated, reduce their rate with data exchange, but contrary to the ISO-LINEAR Chip`s of the federation they are insensitive and one can them without doubts everywhere to stocks even in the trouser pocket without them damage take.