The Safariland Gunshot Residue Kit (GSR, AA) is used for Atomic Absorption Analysis. Atomic Absorption test supplies consist of cotton swabs in tubes and a liquid chemical. The liquid is put on the cotton swabs and rubbed on the suspected shooter's hands. The cotton swabs are then placed back into the tubes and sent to the lab for analysis. Each kit is individually sealed and contains instructions, plastic gloves and an envelope and evidence label for resealing.