Block sharpener offers a lifetime guarantee for factory Imperfections and offer free replacement rods if ever need. You pay shipping for new rods. Our Knife sharpeners handle has a new patent nonslip grip over shot added to bottom side of our sharpener where you will find our name and website. This Black ring you see in this image is to give you great grip when using them of flat slippery surface. we also use our non-slip grip on the top side sharpener where we added a unique Thumb grip and guard. This thumb grip gives you great control when sharpening knives free hand. Like in the woods when there no table available to work off of or when sharpening things like scissors and gardening tools.