Love our Magic Water World Kit? Then you will love our Water Marbles! Our Water Marbles come in a glass bottle with instructions included. Add them to a bowl of water and watch them grow over 3 to 4 hours! Your customers will love the sensory feel and look of the marbles and at $6.95 RRP, they will walk out the door! This listing is for a set of 30 and comes with a display unit. We include a sample for you to display to your customers.