In 1870, a small brush manufacturing company started in Stockholm and still thrives today. The core of Iris Hantverk's business is a brush binding operation where visually impaired craftsmen from different cultures have been making brushes according to an old Swedish tradition for decades. This nail brush is handmade from oil treated oak and tampico fiber that's elastic and waterproof with a certain stiffness that's not too hard. Double-sided brush has shorter, stiffer bristles on top and longer softer bristles on the bottom.