BGA Solder Ball Reballing Soldering PCB Heat Universal Stencil Balls Features: . These tin balls are used for connection of semiconductor chip, circuit module and PCB board. They are quite small and can transmit electronic signal. Each bottle contains about 25000 solder balls that will meet your basic need. There are many different sizes you can choose, and you can choose 9 bottles to get them all. Specification: Type(Optional) Quantity Size Weight #1 9 bottles 0.3      200g/7.1oz #2 1 bottle 0.35mm 9g/0.3oz #3 1 bottle 0.4mm 10g/0.4oz #4 1 bottle 0.45mm 13g/0.5oz #5 1 bottle 0.5mm 16g/0.6oz #6 1 bottle 0.55mm 18g/0.6oz #7 1 bottle 0.6mm 25g/0.9oz #8 1 bottle 0.65mm 28g/1oz #9 1 bottle 0.7mm 36g/1.3oz #10 1 bottle 0.76mm 40g/1.4oz Package list: 1 Set of Solder Balls(include 9 specifications)