This .155" diameter professional grade Cross-Fire Line comes in a 1 lb. donut. The line is designed to reduce grass tearing. This product is compatible with GT-225, GT-225i, GT-230, SRM-225i, SRM-225i, SRM-230, SRM-266, SRM-266S, SRM-266T, SRM-280, SRM-280S, SRM-280T, SRM-225U, SRM-266U, SRM-280U, SRM-410U. | ECHO 126' .155" Cross-Fire Line