The CR-250 Mechanical Candle Refill replaces the Paradise #30 refill. This is a high quality wax mechanical candle refill with an excellent burn that should last for appx. 2.5 hours. At 5.75'' long, we recommend using this mechanical candle refill in 8'' or longer mechanical candles. Made of high quality wax, just slide this wax refill into your mechanical candle, light it and put your worries away. Easy clean up and a great price that makes them affordable to use over and over again. Works well with Koch Mechanical Candles, Paradise Candles and other brands also. Sold in 50 or 250 packs.