These specifications cover the production of No. 10 envelopes requiring such operations as composition, electronic prepress, printing, construction, packing, and distribution. Complete specifications ... These specifications cover the production of No. 10 envelopes requiring such operations as composition, electronic prepress, printing, construction, packing, and distribution. Complete specifications may be found at: https://www.gpo.gogv/how-to-work-with-us/vendors/contract-opportunities.