Double Strength combines a nylon core with a fluorocarbon coating. This construction preserves the flexibility of monofilament for handling and tying knots. The 10/100 version is rated at 2 kg, and the 12/100 version at 2.5 kg. These small line sizes are designed for delicate rigs. The 100-meter spool is used to prepare multiple leaders or to fill a reel with the appropriate capacity.