ABS spool cover and durable nylon line, flexible. Aerodynamic design reduces drag for more efficient cutting. Features an auto feed system that simplifies spool replacement, eliminating the need for hand-winding. Easy to use and install: Remove the cap cover and let automatic winding complete spool changes quickly, saving time and effort. Compatible with BOSCH strimmer trimmer models: ART 23 SL (3600HA5000), ART 23 SL (3600HA5070), ART 2300 (3600HA5002), ART 23-28 (3600HA5001), ART 26 SL (3600HA5100), ART 26 SL (HA5170), ART Easy. Specifications: Spool Line: Nylon cord: 1.6mm, gray Length: 16 ft (4.9 m) Size: 55 x 23.5 mm Spool Cover: Material: ABS Size: 33 x 75 mm Note: Always wear safety goggles and long pants when using this product to prevent injury from flying debris. This replacement spool is designed for light trimming of young grasses only. For thick or woody weeds, use a blade or other appropriate tool. Package includes: 1 x Spool Line 1 x Spool Cover Other items not included