I'd like to add that I bought the ashtray as a 'set' with a neodymium vase designed by Miloslav Klinger for ZBS.
By the way, the ashtray must have nine lives... before taking the second picture below, the ashtray slipped from my achy hands and onto the wood panel floor. It bounced very loudly 3-4 times before it rolled out of my home office. Nothing happened to it! No chips or cracks.