Leaves marks (black rubber) on the floor... the cover could be of better quality.

I have done explosive exercises for a period of 2-3 months, I don't feel anything is going to move. (as has happened to me with a metal handle, where the plastic part came off) As it seems, the hexagonal shape is convenient, you can comfortably leave it on tiles as it is relatively soft on the outside and not metal, but it is not so soft that you would say you can drop it from a height. It weighs 7.5kg, that's it :)