Perune Iso-Butane Gas Canister Four Season Mix Clean combustion all-season fuel mixture, best for Backpacking Designed for use with Perune Portable Stoves and Cooking systems Nests inside all Perune Travel Pick & Carry Cooking Systems Gas Mixture: 72% isobutene, 25% Propane, 3% n-Butane 100Gram Canister. Weight: 8 oz. Dimensions: 4.3" x 4.3" x 3"