Quality material. I like the color and compactness. If I need to buy more for a future update I will buy more of these. I gave 4 out of 5 stars because one of the four bearings on the stem is a bit tight. I'm assuming it's still within tolerance. The other three bearings slide very smoothly over my cranks and I'm very happy with them. I only needed two so the third will serve as a backup if needed and the fourth as a last resort while a new order is on the way.