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Bump Feed, Pivo Trim, Silver-Back, Speed Feed, and more! We have several types of trimmer heads that fit your Solo trimmers. Whether you want a dual line, single line, bump feed, or manual feed trimmer head, Jack's has the perfect one for your trimmer. Select a category below to learn more about that type of trimmer head. Bump Feed Types: Bump Feed, Pro Bump Feed, Silver-Back 4", Silver-Back 6", and Speed Feed. Manual Feed Types: Heavy-Duty Twist Feed, Kwik-Loader, and Pivo Trim.