Clairefontaine Pastelmat Sheets are 360gsm card which has been specifically developed for pastel painting.Clairefontaine Pastelmat card is acid-free, lightfast and age resistant. This unique card combines velvet and pumice, the resulting finish means fixatives are not required. The expression, freshness, lightness and delicacy of pastel colors will be displayed to full advantage on Clairefontaine Pastelmat Sheets.