Troy-Bilt, 17", Split Boom, Straight Shaft, Gas String Trimmer, 29 CC, 4 Cycle Engine, Spring Assist Starting System, 17" Cutting Swath, Accepts Optional Attachments, Dual Line Bump Head With Speed Spool, Uses .095" Diameter Line, Deluxe D-Handle, For Speedspool Version 1, #TB575ss, For Replacement Cartridge Use TV #560-316, For Speedspool 2, #TB575EC, Use Replacement Cartridge #753-06129, For Current Click 'N Trim Head On TB575EC, Use Replacement Cartridge #753-08202, 50 State/EPA Compliant, Electric Start Capable, 2 Year Limited Warranty.