ECX Top Bottom Shock Ends: 1:10 4wd All Made by ECX Electrix; ECX Electrix is a United States based company; parts are sourced from China producers ECX Electrix part number 233002; UPC 605482117040 This item works with: ECX 1:10 4WD Circuit Stadium, 1:10 4WD Ruckus Monster, 1:10 4WD Torment Short Course