The simplest model in the Promecha range, the SP-500P boasts all-metal construction - an aluminium barrel with chromed brass and steel components. The only plastic being the inner lead holder. The weighty grip is knurled aluminium, approx 10mm diameter, and provides a firm grip without being rough. The cylindrical barrel is finished in a natural aluminium colour, approx 7.5mm diameter. Tough build, yet lightweight at 13g. The strong chromed pocket clip is removable. The chromed metal push-button shows the lead size on the end and removes to reveal a replaceable eraser with clearing pin.