Semi-Rigid Card Holder #1 for sports cards and trading cards have an inner dimension of 3 3/16 x 4 1/4. This card holder is made from a thicker 10 Mil (.25mm) uPVC providing additional rigidity than the standard (.22mm) Semi-Rigid holders.
This is the most highly regarded graded card submission sleeve on the market and is used by leading grading services as well as by customers for submissions to grading services.