Columbian Coin Envelopes, 2.25 x 3.5 Inch, Manila, 500 Per Box (CO540) Heavy duty 28 lb. opaque brown kraft material provides privacy of contents; 2.25 x 3.5 inch size; 500 envelopes per box Wide seams and a deep, moisture activated gummed seal secures and protects contents Coin envelopes are ideal for storing and transferring of coins, jewelry, stamps and other small objects, parts and materials