What is the cassette paper capacity and what paper sizes support automatic 2-sided printing?

The standard cassette holds up to 250 sheets (80 g/m2 or 64 g/m2), while the multi-purpose tray holds up to 100 sheets. Paper sizes that support auto 2-sided printing include A4, LGL, LTR, OFICIO, B-OFICIO, M-OFICIO, FLS, Indian LGL, F4A, and custom sizes from 210.0 x 279.4 mm to 216.0 x 355.6 mm. (Page 9, 10)