Clinically proven. Safe. Effective, easy-to-use 2 step metal comb & spray. Lice Elimination Kit Contains: 1 comb & 1 spray. 4 applications. Treats 2 people. 2-step metal comb-one side to untangle & separate hair and the other side to efficiently remove lice and their eggs. Safe, effective, easy-to-use Nix PF Spray-an alternative solution to messy gels, shampoos and mousses. Keeps hair moist while removing lice and nits. Sprays and spreads easily on all types of hair.