These are generic, no-name CNC chainrings made in China and sourced through ebay from various vendors. They are made from 7075 aluminium with black annodising. They are cheap and well made. They last about the same as more expensive aluminium rings from Blackspire etc.
- weighs 36g;
- has "9Speed" laser etched on the side, but they work perfectly with 10 speed chains like the KMC x10SL;
- made from 7075 aluminium plate, 4.5mm thick;
- 4 shift pins with backside shift reliefs machined in.