mbs303MBS303, composed of a 2:1 bispecific antibody structure, binds to CD20 with two arms and CD3 molecule with one arm to increase affinity with tumor cells and decrease the off-target toxicityType MBS303 Historical Part Number S18141 Material CuSn6 Finish (Superior layer) electroplated . tin 5µm: ±2µm: Hardness HV 180 - 210 Solderability : IEC60068-2-20: Solder