[Premium Material]Made from impact-resistant material with a construction that guarantees excellent durability while reducing the risk of breakage or cracking. [Repair Damaged Trimmers]High quality and bump knobs will replace your damaged or worn bump knobs, keeping your trimmer looking like new, ensuring very smooth running and the best performance of your trimmer. [Precise Replacement]Bump knobs fit perfectly on specific model part 537338701 Compatible with 124L 125L 125LDx 128L 128LD 128LDx 128R 128RJ 223L 223R 26LC 32LC 124C 122C 125C 128C 128CD 322C 323C 325C 25Cx and 26Cx. Will also fit other that require this part number: AYP, , Jonsered, , , Pro, , Sears, Weed Eater color:Blue Material:plastic Package Contents: 4 x Trimmer Bump Knob 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.