<https://kingrings.com/product/sizing-rings/#product>
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"ESSENTIAL! Our 3D printed Sizing Rings take the guess work out of finding your perfect fit and each set comes with a $50 or $60 Discount Code to spend on a metal ring when you are ready.\r\n\r\nKing Rings' 2mm size granularity makes a tailor fit experience possible, our sizing rings are the best way to take advantage of this. Whether you are new to penis rings, an experienced user, or a long time collector, our Sizing Rings are a valuable tool. Not only are they \"less than free\", these rings can help you spend your money smarter.\r\n\r\nFree shipping in the US. | Discounted International Shipping\r\n\r\nRead more below for important details!"
<https://kingrings.com/product/sizing-rings/>