BHR HandRollers are 12 cm (4.75 inches) long and 2.5 cm (1.0 inch) in diameter. You simply roll them with your hand across the clay or up the wall of a pot to create a beautiful pattern in the clay.  The MKM Roller Board can help create long smooth rolls and avoid knuckle bumps. MKM rollers are finished with tung oil to ensure durability over many years of use. MKM tools are easily cleaned with water and a soft toothbrush.