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: Remove cap cover. Automatic winding allows you to complete spool changes quickly, saving 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 (3600HA5170), ART Easy Specifications: Spool Line: Nylon cord: 1.6mm gray 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 flying debris. This trimmer line refill is intended for use on light grass trimming. For heavy weeds, use alternative tools such as blade attachments. Package included: 1 x Spool Line 1 x Spool Cover Other items not included