Waterproof storage， waterproof tank， hard oxidation， CNC cutting，outdoor	Color: Black	Function: WaterproofMaterial: Aviation aluminum	Oxidation: the military grade three hard oxidation	Technology: CNC cuttingSize: 13cm*3cm/5.12''*1.18'' appr.	Inner diameter: 2.8cm/1.10'' appr.	Weight: 70g	Package Contents: 1 xWaterproof tank