This versatile OLFA® knife has an anti-slip, cushion-grip handle, giving you added comfort. The bottom is slightly weighted, giving the knife improved balance and stability. An anti-roll device is an extra safety feature, and blade changes can be made with a quick spin of the blade holder. Acetone-resistant handle. Quick-spin blade change. Includes 2 Precision KB4-S, 1 Chisel KB4-F and 1 Curved Carving KB4-R art blades.