... 21MM.can be printing client's artwork on product. pencil set with a plastic window on top of cover ... .Your design and logo is welcome.Tin pencil set is good choice .Easy to take out side ... , designing and manufacturing tin candy boxcase, tin pencil box, tin crayon box6,12,18,24,36,50,60,100 ... colorful pencils), gift pencil case box,coin tin ,commodity ., ...