Designed for use on gravity fed metal detector systems. All Test Balls supplied with certificate of conformity for traceability. Visible certified test balls to the diameter specified. Manufactured from food grade POM-C, laser engraved and foods grade adhesive. Colour-coded for easy identification (Ferrous – Red, Non-Ferrous – Yellow, Stainless Steel 316 – Blue). Etched with test ball size, type, batch number and Loma part number. Overall size: 28-30mm diameter. Shipping The below test balls will normally be dispatched within 2 working days. Ferrous 0.8, 1.0, 1.5, 1.8, 2.0, 2.5 and 3.0mm Non Ferrous 0.8, 1.0, 1.5, 1.8, 2.0, 2.5, 3.0 and 3.5mm Stainless Steel 1.0, 1.2, 1.5, 2.0, 2.5, 3.0 and 3.5mm Delivery of all other sizes will be confirmed after the order has been placed. If your order is urgent, please contact us at [email protected] or via LiveChat Please note for next day delivery, order has to be received by 2pm and Test Balls must be in stock, as indicated in our T&C/FAQ pages.Please check with us before placing the order if not sure.