These are spacers for the Serpent Nitro RC Touring cars. I made 1mm, 2mm and 3mm spacers. The STL files are one of each thickness, the STEP file will print you all 3 in slightly higher resolution. I use ASA and Polycarbonate filaments for RC parts due to strength. Polycarbonate has very little impact resistance but is massively strong, ASA has almost as good impact resistence as ABS but is much stronger than ABS. Both can be printed at home if you have a printer with an enclosure.