No. 10 business envelopes require no moisture to seal. Simply peel back strip and fold closed. Protective strip keeps adhesive free from dust. No. 10 envelopes are made of 24 lb. white wove stock.

Business Source Plain Peel/Seal Business Envelopes - Business - #10 - 9 1/2" Width x 4 1/8" Length - 24 lb - Peel & Seal - Wove - 500 / Box - White