Size: 3.2×6.6inch cash envelopes,8.1×16.8+2.2cm seal, 80g Black Offset Paper. Material: The Black Offset Paper with outstanding durability and sealing and it won’t expose the content inside. Advantages: Safe material, no smell, durable, strong, and not easy to damage. high-capacity: We have 120 envelopes in one copy and the envelopes are 3.2×6.6inch inches and can easily hold 50 $20 cash bills.