The DYE Core air tank is a composite bottle with a stainless steel core.
Still it is light, small and Pi approved.
The Volume of this bottle is 1.3 liters (79ci) with 4500 psi (300 bar)
It comes without a regulator.
Technical details
Weight: 0,8 kg
Pressure: 300 bar
Length: 223 mm
Scope: 350 mm
Lifetime: 10 years (extendable twice for 5 years)