The upgrade kit consists of 5 parts: Front Bumper Set Mini-Explorer Fuel Tank Stand Rollbar Wheels All parts fit entirely in the Open R/C F1 and do not interfere with the electronic kit. They are modeled to be subject to the F1 body by pins supplied. Kind of Filamento to use: PLA Use on: Set Mini-Explorer, Fuel Tank Stand, Front Bumper SoftPLA Use on: Wheels ABS, Taulman or PC (polycarbonate) It is recommended using this material for its high impact resistance at: Rollbar. Enjoy!!!!!!! P.D: For the assembly see the second picture. Thanks to Daniel Noree For the Open R/C F1 files