Professor Motor 2 Sets RED Color Axle Spacers for 3mm (0.116") Axles - Graduated Thickness - injection molded from BRAND NEW TOOLING and using super tough glass reinforced nylon plastic resin. 

Each of the 2 spacer sets has 24 spacers per tree with graduated thicknesses as follows

8 x 0.4mm (0.016")
4 x 0.6mm (0.023")
4 x 0.75mm (0.030")
4 x 1.95mm (0.076")
4 x 6mm (0.236")

These spacers can be used on axles from BRM, Scale Auto, Plafit, Scalextric Sport+, Sloting Plus and many other brands