Abs Spool & Nylon Line: The edger replacement string spool line were made of premium quality raw material, ABS spool sturdy enough, nylon line string flexible, Not easy to break supports fast cutting and longer lifetime. Compatiblity: Spool compatible with Black and Decker GL315, GL337, GL350, GL650, GL651, GL652, GL653, GL655, GL656, GL660, GL670, GL680, GL5530. Convenience & High Efficiency: Allowing for the line to stretch and cushion on impact with hard surfaces, the aerodynamic shape allows less drag for more efficient cuts. easy to use and install pre-wound Tool-less installment, pops in and out of trimmer for ease of use. Use Precautions: Strong centrifugal force and cutting fast during using, recommend to wear eye protection and long pants to avoid unnecessary injury. And this cordless weed eater parts refill is only suitable for tender weed grass. Strong weeds will been recommended to use blades to trim. Size: Cordless grass trimmer spool line diameter 1.65mm to fits line hole perfectly. Spool line length 12.2M provide a wider range of mowing. Material: ABS, polyamide nylon thread, Size: approx. 12.2M in length, 1.65mm inch in diameter Spool suitable for the Black and Decker GL315, GL337, GL350, GL650, GL651, GL652, GL653, GL655, GL656, GL660, GL670, GL680, GL687, GL5530 Package Includes:4 * Replacement Spools