color classification

[5-inch dark blue] first gear [5-inch black] first gear [5-inch sky blue] first gear [5-inch orange] first gear [5-inch white] first gear [6-inch dark blue] second gear [6-inch sky blue] second gear [6-inch orange] second gear [6-inch white] second gear [8-inch dark blue] second gear [8-inch sky blue] second gear [8-inch orange] second gear [8-inch white] second gear