These Clear plastic individual pockets are made from safe plastic and are ideal for protecting Stamps on Postcards, Letters or Stock Approval Cards . They are closed on 3 sides and open on 1 short side so that contents can be slipped easily into the pocket whilst still being fully protected once inside. They are available in 4 popular sizes from 5.75 x 3.75" to 8.75 x 4.5" (see dropdown menu for sizes in mm)