Chessex Lab Dice VI are a great experiment! To determine what dice the company will later produce as part of their normal catalog, Chessex is releasing six special sets of dice in a limited production run. The best selling dice will later be incorporated in their product lineup. The others will no longer be produced. If you like a particular color, this may be your only chance to grab a set. All the dice in this limited, sixth series release comes in a promotional "test tube" with the Chessex Lab Dice label.