Stone Creek™ – Triangle Foam™ Page Fly Boxes High grade poly construction with dense foam & Triangle Slots to hold flies, makes this one of the most popular boxes. This fly box has Triangle Foam™ on both sides plus an additional center page to hold more flies. Replacement Pages are available… Available in two sizes & three colors. Standard Box: 4.25” x 3.5” x 1” Medium Box: 6” x 3.5” x 1.5”) All are available in Grey, Olive or Sand (Tan) colors.