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