Amazon.com : RYOBI 40V HP Brushless Whisper Series 17 in. Cordless Battery Carbon Fiber Shaft String Trimmer (Tool-Only) : Patio, Lawn & Garden
Ryobi Expand-It 18-Volt Lithium-Ion Cordless String Trimmer Power Head (Attachment Capable, Attachments, Battery and Charger NOT Included) - Walmart.com
18V ONE+ HP Brushless String Trimmer/Edger Kit - RYOBI Tools
RYOBI 18 in. 10 Amp Attachment Capable Electric String Trimmer RY41135 - The Home Depot
RYOBI 25 cc 2-Stroke Attachment Capable Full Crank Straight Gas Shaft String Trimmer RY253SS - The Home Depot