2) The ball bearings are called Carbon Bearings ABEC 5.
As compared objects I have two cars, one of Kettler and a bike from Star. The Kettler is slightly more expensive than the Green Dragon, and the BikeStar costs about the same as the Green Dragon. Both the wheels rotate minutes, when I lift up the scooter and the wheels give you a little momentum.
When I give the Green Dragon Scooter high lift and the wheels a little momentum, they stand still after a few revolutions.
This speaks not just for ball bearings and has set my trust in the durability to zero.
I have therefore returned scooter.