4 pack of Campingaz CP250 valve cartridges with high-performance Isobutane gas, allowing it to work better at lower temperatures than other similarly styled cartridges. The cartridge can be removed and re-attached safely, even if not yet empty. The Campingaz CP250 gas cartridge fits the Campingaz Camp'Bistro 2 stove. CP250 valve cartridges are essential components used in propane-powered appliances, including camping stoves, grills, and heaters. These cartridges are designed to provide a reliable and efficient source of fuel, making them ideal for outdoor enthusiasts, campers, and anyone looking to enjoy the convenience of propane-powered appliances.