Dashington Flat Cobalt Blue Marbles, Pebbles (2.5 Pound Bag) for Vase Filler, Table Scatter, Aquarium Decor, Approximately 250-300 Marbles Dashington's High Quality Decorative Smooth Glass Marbles. Perfect for aquarium use, vase filler, craft projects. Item is translucent. Use this item in vases for filler! Looks great spread around centerpiece! Size is approximately 3/4" 2.5 pound bag contains approximately 250-300 marbles.