These Soap Bubble marbles measure about 14mm (.55") in size each. Your lot of 25 marbles will be hand counted from the pictured marble lot. All of the photos shown are of the same marbles, but with a different lighting angle. These beautiful solid clear glass marbles are a perfect, inexpensive way to enjoy a classic game. They also are wonderful for decorative purposes, filling a vase, or for use as wedding center pieces. Ask us about a discount for large quantity purchases for weddings. LIFETIME WARRANTY CERTIFICATE included. FILLING UP A CONTAINER WITH MARBLES: The average marble is about 9/16 of an inch. This means that it will take roughly 250 marbles to fill a one liter (quarter gallon) container. If a marble is made of glass there are typically 80 to 90 marbles in a pound. This means it will take slightly over 2 pounds of glass marbles to fill a 1 liter (quarter gallon) container. If a marble is larger or smaller than 5/8" of an inch, or made of a material other than glass, the number of marbles needed to fill a 1 liter (quarter gallon) container will vary. Please note these are estimates.