Size is as-packaged, or the diameter of loose marbles. ("D" is the diameter of round items other than marbles.)
Transparent crystal base with swirls of opaque white, tawny orange and black swirled in and on the marble. 25 glass marbles (one of them is a 1" shooter!) with colorful header card printed with game rules and fun facts. Don't forget something to keep the marbles in!