These glass marbles are a transparent dark blue. Kids and collectors also call this style marble "clearies". They are approximately 3/4" in diameter. We call these marbles "True Shooters" because they are the only size accepted as shooters in the U.S.A. for tournament play. They are sold in one pound quantities. There are approximately 50 - 55 shooters in a pound. Sizes will vary slightly. Warning!: Choking Hazard. This toy is a marble. Not recommended for children under 5 years.