This solicitation is advertised as a competitive procurement. The issuing office strongly encourages responses from all qualified vendors who may be able to meet the specifications and provide the specified items/services. 6" X 10 1/4" 5753 TIERS Envelope 24lb, white wove, recycled paper, commercial flap with diagonal seam, and moistenable seal. Must meet demands of high speed inserters. Double polystyrene windows.