... : Sealed, 250k/bottle Type:Leaded and leaded-freePrecise diameter and sphericity No contamination and low oxidation Even brightness ... free surface Alloy: Ordinary solder type:Sn63Pb37Sn62Pb36Ag2 Diameter (um): 350, 310 (12 mils), 300 Diameter tolerance: +/- 10um Spheroid tolerance: within ... 1.5% CPK: >/= 1.33Special size: diameter lower than 300um also available 0.25mm,0.3mm, 0.35mm, 0.4mm, 0 ...