Hot Racing SLF63FS261 Progressive Rate Rear Spring Kit Set of 6 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 SLF63FS261; UPC 083745635287 This item works with: Traxxas Rally VXL, LCG Slash 1:10, Rustler VXL Velineon Brushless, Rustler XL-5, Slash 2WD all versions, Slash 4x4 all versions, Stampede 4x4 VXL, Stampede Electric, Stampede VXL, Stampede XL-5