Simply the best and safest mount for your stamps -Maximum protection against sticking, discolouration, dust and humidity. -Stamps held securely in place by strong clamp-type seal. -SF mounts are made from 100% polystyrene (free from softening agents, acids and stabilising chemicals). -Antireflection coating prevents light interference. -Special adhesive on reverse side of film (simply moisten and stick down!). -Pack of 13 strips of various sizes (standard sizes).