Behind its contemporary metropolitan look, keystone hides an ecological heart. Made of porcelain stoneware with a content
of over 40% of recycled materials by weight and manufactured in accordance with the strictest international standards in environmental sustainability, the keystone series is part of the “novabell ecosystem” program, addressed to consumers and designers interested in eco-sustainable solutions. The environmental quality is tested by a prestigious independent institute: bureau veritas has certified keystone in compliance with the leed® evaluation system.