The Hornady Lock-N-Load Sonic Cleaner One Shot Sonic Case Cleaning Solution will take your case cleaning to the next level. The unique cleaning solution is designed specifically for cleaning brass, and is extremely efficient and effective at removing built up carbon residue, tarnish, and oxidation from the entire case. The One Shot Solution, coupled with the L-N-L Sonic Cleaner cleans the inside of the case, as well as the primer pockets and outside of the case quicker and more efficiently than any tumbler on the market. Notes: 1 gallon will provide up to 260 case cleaning cycles This solution is not designed for nickel plated casings, it will turn them black