While the inner sleeve is the most important for the actual vinyl record, you must protect the valuable artwork on the outer covers with an outer poly sleeve.
These 600 gauge Polyethylene Outer covers are probably the thickest you will find and they will hold their shape and provide more than enough protection for your record single covers.
These sleeves are made with high quality virgin materials.Non recycled plastic(food grade).and acid free.
Have no softeners or additives added. And will not stick to the outer cover.Manufactured in the EU.