?ABS spool cover & durable nylon line, flexible. Aerodynamic shape allows less drag for more efficient cuts. With the auto feed system, the replacement spool eases the tedious work of hand-winding spools ?Easy to use and Install: Free a cap cover. Automatic winding allows you to complete spool changes quickly, saves you time and energy ?Suitable for BOSCH strimmer trimmer ART 23 SL (3600HA5000), ART 23 SL (3600HA5070), ART 2300 (3600HA5002), ART 23-28 (3600HA5001), ART 26 SL(3600HA5100), ART 26 SL (000000.). (HA5170), ART Easy Specifications: Spool Line: ?Nylon cord: 1.6mm gray indentation ?Usage: 16FT/4.9M ?Product size: 55*23.5mm Spool Cover: ?Material: ABS ?Product size: 33*75mm Note: Wear safety goggles and long pants when using this product to avoid injury from spilling lines. This cordless weed eater parts refill is only suitable for young grasses. Strong weeds use other tools such as blades to trim. Package included: ?1 x Spool Line ?1 x Spool Cover ?Other items not included