For maintaining your gas powered guns and accessories. • Ultra-light 1.5wt silicone oil for use in GBB/GBBR magazines • 15ml capacity • Waterproof label • Precision eye dropper tip • Spill-proof cap • Enough to lubricate over 10 tanks of propane • Keep seals lubricated without leaving heavy residue. Directions: Inject 2 drops of oil into tank opening every 8 to 10 mag-fills to keep your GBB/GBBRs lubricated and maintained