The boxes are constructed of white corrugated paper. Holds about 350 standard 20pt trading cards. Holds about 560 collectible gaming cards. Exterior Dimensions (WxHxD): 7 7/8 x 3 x 4 1/8. Interior Dimensions (WxHxD): 7 x 2 3/4 x 3 3/4. Ultra Pro Mini Snap Tite. Made with PVC-free and acid-free materials. Can be stacked for easy storage and transport. Holds 2-1/2" x 3-1/2" (63. 5 mm x 88. 9 mm) standard cards