Package quantity: This package includes 3 sewing machine bobbin cases and 15 metal sewing machine bobbins, providing sufficient quantity for long-term use and replacements. Applicable occasions: The bobbin case is designed as a replacement part for sewing machines with front-loading bobbin systems; it can also be used as a spare. Featuring a polished and smooth surface, the case will not cause scratches and ensures smooth operation during sewing, embroidery, and crafting projects. Functional bobbins: These metal bobbins are suitable for various sewing tasks, including mending, handcrafts, and garment repairs. They help reduce thread tangling and unraveling during start and stop operations. Size details: Each bobbin case measures approximately 0.91 inches in diameter; each bobbin measures approximately 0.83 inches in diameter. These dimensions are compatible with most sewing machines, including models from Singer and other major brands. Durable construction: The bobbin cases and bobbins are made of stainless steel, offering rust resistance and durability. They are sturdy and resistant to breakage or deformation. Specifications: Material: Iron Color: Silver Bobbin Size (Diameter x Height): 21 x 12 mm / 0.83 x 0.47 inches Bobbin Case Size (Diameter x Height): 23 x 15 mm / 0.91 x 0.59 inches Hole Diameter: 0.6 cm / 0.24 inches Package Includes: 15 Sewing Bobbins 3 Sewing Bobbin Cases Note: Slight variations may occur due to manual measurement. Color may vary slightly depending on monitor display.