Provided is a picture of an actual Retractable Wire Knife manufactured by McHugh Milieux. Notice the curvature of the tungsten wire. This curvature can be specified to fit your needs, anywhere from 1.5-3mm. All orders come with a 30 day money back garauntee and tax and shipping costs are included in the price. Ready to Order? Just click buy now to pay with credit card. Paying by check? Email your order to sales@McHughMilieux.com. You will promptly be sent an invoice.