△□□●□★◇☆◆●●■〇△△★●◇▽★ Hello, thank you for viewing the product. Immediate purchase without comment is welcome! We ship within 24 hours on weekdays. This is a grooved aluminum bobbin specifically for industrial and professional sewing machines. + Lightweight aluminum material makes it easy to stabilize thread tension. + Rust-resistant, so no maintenance is required. + The grooved shaft (cut type) allows it to be set on a thread winder. Bobbins are consumables, so replace them early if you feel any discomfort! If you want more than 20 pieces, please let us know in the comments. As this is an overseas product, there may be minor scratches or stains due to the manufacturing process or shipping. The color may differ from the actual product depending on the device and monitor settings, output environment, and lighting during photography. We inspect the products before shipping, but if there is a problem with the product, please contact us before evaluation (before the transaction is completed).