They are made of plastic, and the listed sets do not require batteries (Battery: No Battery Used).
Common details include signature body liveries and stickers, realistic wheel and grille styling, air intakes and tailpipes, working-style engines, wings/spoilers, and opening cockpits or doors.
Finished sizes range from small models about 1.5 in (4 cm) high and roughly 6–7 in (15–19 cm) long to large display models around 23 in (60 cm) long and over 5 in (13 cm) high.
Many larger mechanical kits list working engine assemblies (examples in the data include V12, V6, and W16) with moving pistons, steering, front and rear suspension, and working transmissions or differentials. Some also include opening doors, hoods, and functional spoilers or wing elements.
Smaller car kits tend to emphasize play features—driver figures, racing details, and role-play—while still being displayable. Larger mechanical kits focus more on collector-style display, detailed mechanisms, and realistic finishing touches.
Listings commonly cite benefits such as creative thinking/creativity, engineering concepts, fine and gross motor skill development, and sensory development.