QUANTITY – you can choose 25pcs,36pcs,50pcs or 72pcs bobbins with assorted colors sewing thread is enough to use for a normal daily using STANDARD SIZE TO FIT MOST SEWING MACHINES – Bobbin size: Standard size can be used on most sewing machine like brother, babylock, janome, Kenmore, singer etc. Perfect for anyone just starting out with an embroidery machine or a sewing machine KEEP THE BOBBINS ORGANIZED – Comes with two clear case with each bobbin in a separate spot that is very organized, plastic made with clear view is easy to see which color to choose FREE MEASURING TAPE – Come with free 60cm soft measuring tapes for craft using PRODUCT WARRANTY AND CUSTOMER SERVICE - We provide 48-day money-back and 24-month warranty. So feel free to contact us if you have any question