Dia-Foam Impression Boxes come 10 boxes to a case. The foam is produced by BIO-FOAM(R)which is the highest quality foam on the market. These foldable impression boxes are easy to use and cost less than our competition. Instructions on how to cast a patient are in the box. Our mailing label is already imprinted on the box. Use these foam box impression for your custom orthotics and custom diabetic inserts.