Ring box/generic container with sliding lid. Pattern on lid for thumb grip to open. 2 profiles included - one with 4 ring holders and one that is empty. Looks great with effect sheet build plates.

UPDATED: New version's lid slides smoother and with less resistance. Shouldn't need any breaking in or sanding. 

Sliding mechanism gets smoother with use. Can also sand bottom of lid on a flat surface to make sliding even smoother.