1. These sewing machine accessories can hold the thread spool firmly to prevent the tails from unraveling and coming loose, and they are helpful in keeping things organized and from getting messy. 2. Made of soft silicone, flexible and reusable. These spool clamps always curl back to their original shape when removed from the thread bobbin. 3. Suitable for all kinds of spools, small or large diameter spools, home sewing or embroidery bobbins. 4. Easy to put on and remove from the spool, no space problems when used with the spool stored on the rack. 6. Note: They are not fit for commercial, industrial, or very large size spools. These thread spool savers are thin enough to not take up much space when stored in a wire rack or box. Flexible silicon material allows adjusting these spool clips to fit most spools of various sizes. Bright colors (green, blue, orange, pink) can be paired with a variety of colored threads to add fun to your sewing and embroidery process. Read more Plastic Bobbin Plastic Bobbin Plastic Bobbin Plastic Bobbin Plastic Bobbin Plastic Bobbin Color Black Green Pink Orange Transparent Red Plastic Bobbin Plastic Bobbin Plastic Bobbin Silicone Bobbins Ring Holder Silicone Bobbins Ring Holder Silicone Bobbins Ring Holder Color Purple Yellow Blue Rose Red Pink Light Blue Silicone Bobbins Ring Holder Silicone Bobbins Ring Holder Silicone Bobbins Ring Holder Silicone Bobbins Ring Holder Silicone Bobbins Ring Holder Silicone Bobbins Ring Holder Color Gray Purple Dark Blue Red Green Blue