Magnetic stripes are commonly found on credit cards, bank debit cards, prepaid telephone and vending cards, mass transit cards, drivers licenses, employee badges, membership cards, library cards, loyalty cards and access control cards. This technology is used in industries with low to medium data storage needs. Magnetic stripe cards are simply PVC cards with either black or brown stripes on them made up of magnetic particles of resin. Brown stripes are generally low-coercivity (LoCo), while blank stripes are high-coercivity cards (HiCo). Coercivity is the ability of the magnetic tape to resist demagnetization. The higher the coercivity, the harder it is to encode (and erase) information from the stripe. Magnetic stripe cards can both be printed and encoded in a printer / encoder equipped with a magnetic head. Magnetic stripe can be done tree tracsk. Alphanumeric on first one and numeric on rest of the two tracks.