Clover Stack N Store Bobbin Tower will keep your bobbins organized! This innovative tool neatly organizes up to 30 bobbins. It can hold any type of bobbin and secures threads -- no more tangles! Conveniently see all your thread colors at a glance. Nancy Zieman - This tower has 6 layers of bobbin holders, and each layer can hold 5 bobbins. There are 3 Green and 3 Yellow layers, and the layers can come apart if you want to travel with them. It is approximately 3 1/2"x 2 3/4".