All of the pieces measure at 3.5 inches (90mm) and come with either a black or white base. There are also some close-ups of the pieces below, where you can really see all the detail put into these pieces.
Naturally, Luffy is the king of the set:
Nami is the Queen piece:
Sanji plays the role of the Bishop:
Zoro is the Knight:
Usopp takes the position of Rook:
And, last but not least, Chopper takes the place of the pawn.