Rohema JB 3 brushes have resistant bristles made of nylon. This plastic comes from European manufacturing and has a very smooth surface. It produces rich, low-frequency sounds. Overall, the JB 3 nylon brushes sound a bit bulkier than their metal counterparts with thin wires. The JB 3 brushes' handle is made of durable Hickory and has a diameter of 15.5 millimeters.