Columbian CO575 (#7) 3-1/2x6-1/2-Inch Coin Brown Kraft Envelopes, 500 Count Envelope is ideal for storing and transferring of coins, jewelry, stamps and other small objects, parts and materials. Heavy-duty 28lb opaque brown kraft material provides privacy of contents. Wide seams and a deep, moisture activated gummed seal secures and protects contents. (#7) 3-1/2" x 6-1/2" 500 envelopes