Got these for the wife since she's now making masks since we are now in the height of the "Dark Times" with Covid-19. Since she is using a mide array of different color and pattern material she needed more bobbins for the different colors and more needles as they will get dull. This pack was just what she needed. 20 bobbins for any colors she may need to swith out quickly and easily. 5 needles to keep things running smooth and sharp The included fabric tape measure is a nice extra and the case for the bobbins stores easily in her sewing machine case. This will be everything you need for sewing medium weight material.