Bat Bases- rubber/steel sheet for use with magnetically-based figures.

£3.49

This pack includes enough self-adhesive rubber sheets impregnated with iron filings to line the bottom of two 4 Litre Really Useful Boxes (box and minis are not included). It is intended for use with magnetically based-miniatures and will help with safe storage and transport.
The material has a peel-off backing sheet and can be applied in seconds. If you should wish to line a larger or smaller container, the material can be easily cut to fit with a craft knife or scissors. 
This is the most efficient way to apply the sheet, in my experience:-
1. Peel back about an inch of the backing
2. Carefully align this at one end of the box and press into place.
3. Gradually peel the rest of the backing, a couple of cm at a time, whilst pressing the sheet against the box, avoiding the formation of air bubbles.
4. Stick the small extra strip in place.
If you get any air bubbles you can prick them to let the air out.