Maestro by da vinci is the world"s last hand interlocked hog bristle brush in a complete range of shapes and sizes * Hand built and interlocked by skilled brushmakers with the best materials european sizing * Made with the natural curve of the bristle turned inwards, two equally sized tufts of bristle are set against each other without tension and made to interlock * Other Maestro filbert shapes are Series 7400, which has a shorter length than 7900 * Da vinci"s very popular maestro 2 hog bristle is a modern update to the maestro traditional construction