White, Gum Flap, 500/Box. Manufacturer: ‎Dronka Envelope. Paper, Gum Flap. #1 Coin Envelopes 2 1/4 x 3 1/2. 500 Envelopes with Full Flap. Size: ‎500 Envelopes. Shape: ‎Rectangular. Item model number: ‎DC1W.