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: 37 Hours; Size: 2 1/2"; Material(s): Glass/Cotton/Mineral Oil.