A pack of three medium-size replacement mantles for Campingaz gas lanterns that take medium mantles. The mantle is the small fabric sock that is tied onto the burner; once fitted and burnt off, it glows white-hot and gives the lantern its bright light. Mantles become very fragile after the first burn and break easily when the lantern is knocked or transported, so it is worth keeping a spare pack in the camping box. To fit, tie the mantle onto the burner, light it with the gas off to burn away the fabric, then turn the gas on and light the lantern. Check your lantern's manual for the correct mantle size.