Features 8 wood and 4 steel rollers of various sizes. In wood, 20,15,13,11,10,7, &5mm sizes. In steel, 3.5,2.5,2.0,1.5mm sizes. 3 ½ “x 3 ½ ” Base CNC Machined from high grade aluminum. Machined channels are perfect for your rolling needs. Includes tips on basic techniques in using this set. For more PE tools see the PE Tools section of etoarmour.com sight. For more PE tools see the PE Tools section.