Used 2 x 8s as the selection of 2 x 10s at Lowe's was meh.
Two notes for anybody that builds:
1) cut the 4x4 crossbars at 45* the instructions say 47. They leave a gap when you cut them at 47.
2)Also, utilize your leftover 4x4 blocks from the legs for your feet. Otherwise it is short height wise