NIK Fentanyl testing kit contains 5 boxes of tests to complete the testing sequence plus a box of neutralizer. NIK recommends a testing sequence for the presumptive detection of Fentanyl. The use of multiple tests helps eliminates the chance of erroneous presumptive identification of an unknown substance. Kit contains NIK tests A, B, I , K and W to complete the testing sequence. A box of neutralizer is also included. When testing unknown white powders officer safety is of the utmost importance.