This black pen presentation box made from 350 gsm card and are made from high quality kraft card source material for durable and long-lasting use. They have a cut out window along the top which makes it ideal for gifts and displaying handmade pens. 

Dimensions:-
Length  180mm
Height   20mm
Width    40mm

These come in a pack of 4. The will come supplied flat for easy assemble, please see demonstration below

Video how to fold the box, once folded slide into outer sleeve to finish.