Pre Twisted Natural Real Rush 2.2 pound Coil Single Twist Sea Grass Cord This comes in 6/32" (4-5mm) and 7/32" (5-6mm) Used for Chair repair seat weaving. It can be substituted for genuine cattail rush. It's made out of a seagrass material that is twisted to look like cattail rush. A 2.2 pound coil should be enough to do an average-sized seat.