This box is molded in translucent polypropylene, so you can view the small supplies or up to 30 bobbins that fit inside it easily. Permanent dividers securely separate the contents and the secure lid prevents "migration". It also bears a printed pink ribbon, and a portion of its sale is donated to the National Breast Cancer Foundation, Inc., for their fight against breast cancer. Size: 5.88" x 3.5" x 1.31"