mbs303MBS 303 is a bispecific antibody targeting CD3CD20 being developed by Beijing Mabworks Biotech for the treatment of B cell non-Hodgkin lymphoma. TheType MBS303 Historical Part Number S18141 Material CuSn6 Finish (Superior layer) electroplated . tin 5µm: ±2µm: Hardness HV 180 - 210 Solderability : IEC60068-2-20: Solder