Craftsman, unique, high quality watch bottom case. With a high electrical resistance along with anti-impact and anti-scratch properties, this durable and sturdy watch case promises to withstand everyday wear and tear. Frame and complete meticulously designed and carefully assembled watches with this highlighted piece.

• High-quality sapphire crystal watch case.
• With anti-impact and anti-scratch features.
• With high electrical & corrosion resistance.
• Features great thermal stability.
• With high optical production rate.
• Features a high melting temperature of 2030 °C.
• With a high hardness of 9 Mohs, which is second to diamond.
• Purity: 99.99%.
• Density: 3.98-4.1g/cm2.
• Compressive strength: 21000kg/cm2.
• Flexural strength: 4000kg/cm2.
• Infrared transmittance: 85%.
• Dielectric constant: 7.5 - 10.5.
• Place of origin: China.
• Color: transparent or custom-made.