Liquid wax candle cartridges are clean-burning and consistent. They are convenient when table/lighting space is at a premium. Mess-free and easy to use, never leaving soot or wax behind. Designed to burn more efficiently than candles. Lamp/Candelabra Type: Lamp; Approximate Burn Time: 18 Hours; Size: 1 7/8"; Material(s): Glass/Cotton/Mineral Oil.