Premium replacement line blades compatible with for Aero-Flex , superior to traditional trimmer spool line, is a completely new cutting system. Easy to install, no worries about missing parts, minus the wire winding assembly link.weed wacker blades are made of copolymer flexible material, which effectively reduces the risk of breakage during operation and increases working life. Tips: Please try to avoid direct collision with stones, tree roots, cement block walls and barbed wire when workingcolor:Yellow + greenMaterial:plasticPackage Contents:32 x Flexible Line BladesOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.