The chairs shall primarily be used in connection with teaching, but also for concerts, shows, etc. All chairs shall be delivered with installed writing top which shall easily dismountable/ demountable. In addition to be easily removed from the chair, it shall be possible to lock the writing top the chair (alternatively removed). 55 chairs shall be delivered with writing tops installed on the left hand side of the chair (for left handed), the remaining 525 chairs shall be delivered with top installed on the right hand side.