BERNINA CB Hook Bobbin Case for Bobbin Work

The BERNINA CB Hook Bobbin Case for Bobbin Work is a specialized red-marked bobbin case designed for sewists and embroiderers who want to incorporate heavier threads, narrow ribbons, and decorative tapes into their work. Because these materials are too thick to pass through a needle eye, this bobbin case holds them on the bobbin side, allowing the texture and visual interest to emerge on the underside of the fabric — which becomes the right side in bobbin work. It is a straightforward, reliable accessory for anyone working on a compatible CB-hook BERNINA machine who wants to expand their creative possibilities.

Key Features

• Engineered specifically for bobbin work, allowing heavy-weight threads, narrow ribbons, and decorative tapes to be used in the bobbin rather than through the needle.
• Identified by a small red triangle marking, making it easy to distinguish from your standard bobbin case at a glance.
• The relaxed tension of this case accommodates thick materials that a standard bobbin case cannot feed smoothly.
• Compatible with the CB-hook system used across a range of BERNINA activa, 3 Series, virtuosa, aurora, artista, and select numbered models.
• Enables underthread sewing techniques where the decorative element faces downward during stitching and the fabric is flipped to reveal the finished design.
• Sold as a single bobbin case ready to load with your chosen heavy-weight thread or ribbon and begin stitching.
• Works with the same CB-hook bobbins already used in your compatible BERNINA machine — no additional bobbin purchase required.
• Supports a wide range of decorative threads including perle cotton, yarn, narrow ribbon, and decorative tape for dimensional surface embellishment.

Specifications

This bobbin case is a practical addition for any sewist or embroiderer working on a compatible CB-hook BERNINA machine who wants to explore bobbin work — a technique that adds rich texture and dimension to garments, quilts, and embroidery projects. OSP Machines is an authorized dealer and provides free support for the life of your machine. Reach out to the OSP Machines team any time you have questions about setup, technique, or compatibility — support is included at no charge for as long as you own the product.

CB-hook Bobbins and Bobbin Cases are required for the following machines: 

• For all BERNINA activa and 3 Series machines
• BERNINA virtuosa
• BERNINA aurora
• BERNINA artista 165, 170 and 630
• BERNINA 555 and 570

Frequently Asked Questions

What is bobbin work and why do I need a special bobbin case for it?

Bobbin work is a sewing and embroidery technique that uses decorative heavy-weight threads, narrow ribbons, or tapes wound onto the bobbin rather than threaded through the needle. Because these materials are too thick to pass through a needle eye or be tensioned normally, a specially calibrated bobbin case — like this one — is required to allow the material to feed smoothly. You stitch with the right side of your fabric facing down, and when you flip the work over, the decorative thread or ribbon appears on the surface.

How do I tell this bobbin case apart from my standard BERNINA bobbin case?

The BERNINA CB Hook Bobbin Case for Bobbin Work is marked with a small red triangle, making it easy to identify and separate from your regular bobbin case. Store them in different compartments of your accessory box to avoid mix-ups when switching between standard sewing and bobbin work.

Which BERNINA machines is this bobbin case compatible with?

This bobbin case is designed for BERNINA machines that use the CB-hook system. Compatible machines include all BERNINA activa and 3 Series models, BERNINA virtuosa, BERNINA aurora, BERNINA artista 165, 170, and 630, as well as the BERNINA 555 and 570. If you are unsure whether your machine uses a CB hook, check your machine manual or contact OSP Machines for guidance.

Do I need to purchase special bobbins to use this bobbin case?

No. This bobbin case uses the same CB-hook bobbins that came with your compatible BERNINA machine. You simply wind your chosen heavy-weight thread, ribbon, or tape onto your existing CB bobbin and load it into this specialty case.

What warranty and support comes with this bobbin case purchase from OSP Machines?

OSP Machines is an authorized BERNINA dealer and provides free support for the life of your machine. If you have any questions about using this bobbin case, setting tension for different materials, or compatibility with your specific model, the OSP Machines support team is available to help at no charge.