Just like it says. Pellets or course powder is pressed until it forms a solid. There are several suppliers for our entire industry and they each have different codes for them, depending on the color and transparency. These codes can make it seem like you’re getting many different kinds and grades of sintered but they’re all pretty much the same as far as you and I will ever tell. True Sintered is harder and more expensive than extruded and it can be faster for those that ride aggressively fast. But to do that, it needs to be waxed and prepared for local conditions.