ASLAN BB910- Blackboard Vinyl - Self-adhesive blackboard film that is ideal for changeable lettering in meetings rooms, schools and kindergartens. Splash and scratch resistant, easy to clean. Use with liquid chalk pens or chalk stick. Thickness: 130 micron. ¹Maximum Service Life: 5 years. Service year life based off European, vertical conditions. For approx NZ year life refer to www.signsupplies.co.nz/yearlife. ASLAN Blackboard C 61 - Different hard and smooth surfaces turn into a trendy memoboard with this self-adhesive blackboard film. It can be written on with chalk as often as you like. In facilities such as offices, nurseries and schools or private homes walls turn easily into blackboards with frequently changing writings. Thickness: 160 microns. ¹Maximum Service Life: 2 years. Service year life based off European vertical conditions.