〇●■●☆■■△▲◆◆□△□◆●☆□●□ Hello, and thank you for viewing! Instant purchase without comments is welcome! All items are free shipping, and we ship within 24 hours on weekdays. This is a grooved aluminum bobbin specifically for industrial and professional sewing machines. ● Lightweight aluminum material makes thread tension more stable. ● 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! We also sell sets of 10. If you would like more than 20, 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. We inspect the items before shipping, but if there is a problem with the product, please contact us before rating (before the transaction is completed).