The AdirOffice 637 Suggestion Box is perfect for suggestions, ballots, donations, business cards, and contest entries. It measures 6.25 in. L x 4 in. W x 4 in. H and is made of durable, opaque acrylic. The box features a sturdy lock with a set of two keys. Additionally, there is a removable message display that is fully customizable for posters, messages, promotions, etc. Display is 4 in. W x 6 in. H.