This Mini Acrylic Suggestion Box is made of clear acrylic that makes it see through so people get the boost to donate seeing how it fills up It may be used as a suggestion box or donation collection box. The top slot measures 4Wx 3/8D to accommodate cards as large as 4 x 6 dollar bills and coin donations. Suggestion box comes complete with a clear header that holds 5w x 7h inserts to announce your fundraising goal or company name and information.