This kit has everything guitar and bass players need to keep their instruments in top playing shape, from quick string changes to complete setups. The kit includes the following: System 65 Superlube Gel Pen, Multi-Function Gig Light, Fret Polishing Cloth, Fret Collars (.080" & .125"), Compact String Cutter, Four-Way Screwdriver (2 flatheads & 2 phillips), Multi-Spanner Uni-Wrench, Formula 65 Polish & Cleaner, String Action Gauge, microfiber polish cloth, Hex Key Multi-tool, Universal speedwinder.