1.MEET YOUR NEEDS TO EXTENT:17 PCS of calibration weights include 1 x 100g,1 x 50g,2 x 20g,1 x 10g, 1 x 5g, 2x2g, 1x 1g, 1x500mg, 2x200mg, 1 x 100mg, 1 x 50mg, 2 x 20mg, 1 x 10mg,with 13 different specifications in total.Various scales for precise measuring. Enough quantity for your use. 2.EASY TO STORE:In addition to the calibration weights, the set is also equipped with tweezers and a plastic storage box for easy use and storage.It can be stored neatly after use, so you don't have to worry about not finding it when you want to use it next time. 3.EASY TO GRASP:Our weights are conjoined cylindrical, with raised parts on the upper end, easy to grasp.When you are using it, you don't have to worry about slipping and dropping your hands because you can't hold it, and you don't further delay your work progress. 4.STRONG DURABILITY:Using No.45 steel material, it has higher strength and less tendency to deformation than ordinary steel.These small weights are useful to test the accuracy of scales, keeping your scale calibrated. Making your experiment more effective.