Could you be a bit more specific I am not sure of what you mean ? Not saying you are close or not, I just don't want to dismiss if I don't know exactly what you are meaning
Thin white foam that coins get wrapped in when you post them - you know the stuff that's like 4mm thick
Like in the picture of post #3 here http://forums.silverstackers.com/topic-19523-royal-silver-andean-cats-for-sale.html
For those that said Bubblewrap, this is BW @ 20x Mag so similar but not the same. This is the 4mm foam as mentioned above - 200 x Salt Sticky Tape Tinsel 230 x Mag 1 piece