[Compatible Models] ART 30-36 LI, ART 30, ART 27 and ART 24. Spools Product Number: F016800351. [Autofeed System Replacement Spool] trimmer replacement spool is compatible with the lawn mower, and can use centrifugal force to transport the trimming thread as needed, effectively reducing the tedious work of manually winding the spool. [High efficiency] The spool line can be stretched and cushioned under the impact of a hard , and its aerodynamic shape allows more effective cutting and reducing resistance, making weeding more efficient. [High quality] The flexible and strong nylon spool is made of high-quality ABS material, which can easily pass through grass and weeds. Excellent spool, not easy to break, supports fast cutting. [Packing list] 4 x F016800351 replacement trimmer spool. Spool specifications: Line length: 6.1 m/20 ft, diameter: 1.65 mm/0.065 inches. Color: black, gray Material: Nylon, ABS Package Contents: 4pcs String Trimmer Replacement Spool Line Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.