I use the containers that my testing strips come in for bobbins. Each one hold 6. You can have 6 ready in the same color and easy to find. I also use a piece of 4 by 4 that my hubby cut slanted for me to put my foot pedal against. Not only does it not go anywhere but, at the angle like that it relieves pressure on my hip and back. The difference was unbelievable.