Contents: 3 gas refill adapters. Weighs only 5g, making it easy to carry while hiking and camping. This adapter allows you to refill your gas canister using a butane lighter. Lightweight design for convenient portability during outdoor activities. Made of copper material. Use in a well-ventilated outdoor area only. After filling, always check the canister seal to prevent leaks. Do not include gas tank. Instructions: 1. Weigh the unused butane canister and mark the weight on the base with a marker. 2. Place the empty canister in the freezer for about half an hour or overnight. 3. Remove the canister from the freezer and attach the adapter to the canister. 4. Connect the full butane canister to the adapter and press firmly for 10–15 seconds. 5. Check the weight after each refill until it matches the original marked weight. Scope of delivery: 3 gas filling adapters.