Zinc Yamaha Trim Tab Anode for 200 - 300 HP Motors A trim tab anode helps counteract the torque that a propeller creates, and levels out "prop-walk," which is a propeller&';s tendency to rotate concerning a vertical axis. Also, trim tab anodes can absorb various types of corrosion, helping alleviate corrosion to other parts of the boat.Features: Designed for 200-300 HP Yamaha motors Meant for saltwater boat use Boat type: Motorboat with outboard Specific: Outboard Specifications: Material: Zinc Weight: (lbs) 1.40 / (kg) 0.64 Dimensions: h: (inch) 1.18" / (mm) 30 h1: (inch) 2.36" / (mm) 60 : (inch) 3.94" / (mm) 100 m: (mm) 10 x 1.25 *Sold as an Individual Specifications:Material: ZincQuick Guide (pdf)