The Shark air system has an aluminium bottle with a steel core. 

A very reliable and reasonable air system ideal for beginners. 

The Volume of this bottle is 0.81 litres (48ci) with 3000 psi (200 bar). 

The bottle is Pi approved. 

It comes with a regulator.

Technical details:

Weight: 1,2 kg
Pressure: 200 bar
Length: 197 mm (with regulator)
Scope: 281 mm
Lifetime: 10 years (extendable twice for 5 years)