Traditional Craftsmanship. The Iris Hantverk company produces high-quality handmade household items using techniques that date back to the 19th century. Enlisting the skills of top designers to conceptualize their products, they hire and support visually impaired craftspeople to create these meticulously assembled pieces. The time-honored techniques of traditional Swedish craftsmanship has been used by IRIS Hantverk for more than a hundred years. They still draw every brush by hand and use natural materials almost exclusively. Backs and handles are made of birch, oak or beech. The bristles are made of various materials such as horsehair, goat hair, Tampico fiber (from plants unique to the semi-desert areas of northern Mexico) and piassava (bass) fiber, depending on their use.