This is reusable mold making material. You soak it in hot water. Wait for it to become maliable. Make your mould whilst it is warm. Let it cool thoroughly. Then create from your mould - and when you soak the Oyumaru again it can be used again.
There are 12 colours in the pack (of course they can be mixed) - each tiny strip is 58mm long and around 17mm wide The pack weighs 70gm.