Inter-department envelopes are ruled for interdepartmental routing on both sides. Standard style has five columns printed with DATE, DELIVER TO, DEPARTMENT, SENT BY and DEPARTMENT on both sides. Six see-through holes ensure no important documents are left inside. Envelopes feature a string-and-button closure and 28 lb. Kraft stock. Envelopes contain 30 percent recycled material with 20 percent post-consumer material.