This season saw the introduction of the blue and white livery that the cars would wear through several changes of sponsor, until the team's demise in 1992.
Little kids are too light to wear through all of that thick rubber, and they sit for long periods awaiting service for the next niece or nephew or friend's child.
Thanks to the larger bearings, the drive systems are considerably stronger and more durable, since wear through radial and axial forces is further minimised.
The inside portion of the home button will rub against the touchscreen ribbon cable and eventually wear through the protective coating and ground out the touchscreen.