The friction reduction ring buffers the 2 main grinder parts. It what makes this grinder so special, it is smooth and keep your medicine clean.The design is based on a bearing principle, this ring absorbs the pressure created  by the friction generated at grinding. The ring, intentionally, is softer than the grinder parts, which are made from Aluminium, - making it the first to wear out. We use only  USP CLASS VI approved materials - which are Bio-Compatible and tested and approved by the FDA for food and medical applications. The Friction reduction rings degradation is locked outside of the grinding chamber. As the ring is softer than aluminum, it will get chunks displacement rather than microscopic dust, so you can easily address maintained and prevent medicinal contamination.