CAT’S BEST NatureGold is a pure natural product, produced from 100% renewable organic fibre – raw material without artificial and chemical additives. For the production of CAT’S BEST NatureGold we only use finest organic fibres, which come from untreated, domestic fir and spruce wood. These plant products occur continuously and healthy forests are maintained. For this we are certified according to PEFC. http://www.catsbest.eu