The (Best of Chessex 7 Die Set Sampler) consists of a cardboard tri-level display holding 18 boxes of Polyhedral 7 Die Sets but you get 25 boxes of sets. Chessex includes their best selling colors in this selection to encourage easy sales of the better sellers to reduce costly and unwanted overstocks. So 18 fit on display at a time and you only pay for 24 boxes so the display and extra set are free!