user-friendly competitive price small MOQ timely delivery Specificatins of Micro-ringMaterial: cooper, silicon, aluminumDiameter: 3mm, 3.5mm, 4mm, ... and our most valuable capital is the proficient workers with rich professional experiences. 3. Our factory possesses advanced ... computer design capabilities.4. We promise to provide you with top quality products, unbeatable price, fast shipping and less ...