Pre Twisted Natural Real Rush can be substituted for genuine cattail rush. Pre twisted natural real rush size 6/32 (4-5mm) comes in 2 lb coils on a wood shuttle OR in a coil without a shuttle. Size 7/32 (5.5-6mm) only comes with the wood shuttle. The 11 lb spools are size 5/32 (3-4mm) and 6/32 (4-5mm). These are hand twisted and will vary in width and color throughout the coil.