1. Easy to install and operate. 2. Made of rubber durable and light weight. 3. Size: External Impeller Overall Diameter: 52.25 mm Internal Shaft Insert Diameter : 12.86 mm; weight: 12g 4. OE number: 63V-44352-01-00. This is just for reference, please check and confirm the OE carefully before purchasing. 5. Fits for Yamaha: 9.9M 9.9hp 2-Stroke 1999 & Newer 15M 15hp 2-Stroke 1999 & Newer T8 8hp 4-Stroke 2001 & Newer T9.9 9.9hp 4-Stroke 2005 & Newer F15 15hp 4-Stroke 1998 & Newer F20 20hp 4-Stroke Outboard Motors, Camera Filters, Filter Camera, Pc Keyboard, Wifi Antenna, Gps Tracker, External Lighting, Camera Cleaning, Ipad Keyboard