Part Number Description 857750-902 ZORBAX RRHD 300SB-C18, 2.1 x 50 mm, 1.8 µm 858750-902 ZORBAX RRHD 300SB-C18 2.1 x 100 mm, 1.8 µm 857750-906 ZORBAX RRHD 300SB-C8, 2.1 x 50 mm, 1.8 µm 858750-906 ZORBAX RRHD 300SB-C8 2.1 x 100 mm, 1.8 µm