Hot Racing Traxxas Spartan/M41 CNC Steel Conical Bullet M4 Prop Nut SPN05N Made by Hot Racing; Hot Racing is a United States based company; parts are sourced from Chinese producers All Hot Racing upgrade parts are direct replacements for stock components; additional parts are not required Hot Racing part number SPN05N; UPC 083745919479 This item works with: Traxxas Boat: DCB M41 Catamaran, Boat: Spartan