The standard set comes with:

166 black-backed Tiles (see illustration), approximately 1 1/8" x 7/8" x 1/2",
Includes: 

8 extra Flower tiles
2 extra Joker tiles
4 blank tiles

4 Racks and Dice

Chips (not necessary for American Mah Jongg)
A "Bettor"  (not necessary for American Mah Jongg)

Deluxe Trays (to hold tiles) and Case in faux alligator, set and case weighs approximately 13 lbs.