Color:

20*30 comes with a white lanyard pen

25*35 comes with a lanyard whiteboard pen

30*40 comes with lanyard gift bag

30*40 removable buckle gift bag

35*50 comes with lanyard gift bag

35*50 removable buckle gift bag

40*60 comes with lanyard gift bag

40*60 removable buckle gift bag

Dimensions:

Black and white double-sided writing

White face, white face, double-sided writing

Green white double-sided writing