Replacement Twist Grip Throttle (4 wire-single speed), compatible with: E100 (version 10+)E125 (version 10+)E150E175(version19+)E200 (version 24+)E300 (version 20+)Power Core E100 RX200 Razor Part #W13113601043 Note: Model versions can be determined by the 7th & 8th digits found on the product ID code on your Razor product.