MATERIAL QR CODE. Say goodbye to the hassle of finding the optimal processing parameters. It only takes two steps: place the QR code sticker/card into the machine, then click the "Refresh background" button and immediately apply the optimal processing parameters. You can click here to learn how to use automatic QR code recognition with the P series or F series. (*Please note that the automatic scanning function requires a camera. Non-camera machines (F1/S/M1U/D) can manually scan the QR code to quickly obtain the optimal processing parameters.) Diameter: 3", made with durable, waterproof fine PU leather with strong stickiness and 3M self-adhesive backing. All Laserable Leatherette Round Patches can be engraved by all xTool machines. It contains 10 round patches and 1 sample patch for the parameter test. All-stitched outlines and nice colors are ideal for personalizing decorations for any occasion.