1. Color
2. Shape
a. Sharp/smooth edges
b. concave/convex parts
3. Size
a. Big/small
b. short/tall/narrow
4. Series
a. X-Ray series
b. Gameover series
c. Mixed signals series
d. Sugar rush series
5. material (metal/plastic/rubber)
6. Wheel type
a. 3 or 5 holes
7. Date
8. Price now (in box)
9. Popularity
10. Real custom or concept
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