The Companion Pro: Fuel Gas Canister 220G - 4 Pack contains 4 gas canisters that are resealable, lightweight and portable. The Rim Vent Release (RVR) technology is a safety feature which allows gas to release if a build up of pressure occurs in the cartridge. 

Companion Pro: Fuel Gas Canister 220G - 4 Pack Features:

• Suitable for four season use
• Complies with EN417 and DOT2P safety standards
• Mix of 45% butane, 28% isobutane and 26% propane
• Sold in a convenient 4 pack

Companion Pro: Fuel Gas Canister 220G - 4 Pack Specifications:

Capacity: 220g