□▼△〇▽■〇◇◆〇☆▽▽◆▲◆◇★△● Hello, thank you for viewing this product. Immediate purchase without comment is welcome! We ship within 24 hours on weekdays. These are grooved aluminum bobbins specifically for industrial and professional sewing machines. + Lightweight aluminum material makes thread tension easier to stabilize. + Rust-resistant, so no maintenance is required. + The grooved shaft (cut type) allows it to be set on a bobbin 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 these are overseas products, there may be minor scratches or stains due to the production process or shipping. The color of the actual product may differ from the images depending on the device, 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 leaving a review (before the transaction is completed).