EZ BOB Bobbins
The perfect little item for knitters and weavers, especially for intarsia. It's also a great tool for tapestry weaving, needlepoint or embroidery. Flip one open to wind on yarn, then flip it closed and your yarn will not unwind without a little assistance from you.
Available in 3 sizes: Small with 10 bobbins, Medium with 8 bobbins, and Large with 4 bobbins.