... small MOQ timely delivery Specificatins of Micro-ringMaterial: cooper, silicon, aluminumDiameter: 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 6mmColor: black, dark/ medium ... . Our factory possesses advanced techniques and equipment, high technology and independent computer design capabilities.4. We promise to provide you with top ... contact us. We will answer you within 24 hours. copper micro ring