Flip these bubbles like an hourglass to watch the liquid elements inside squeeze, slip and float to the bottom without any power or mechanical parts. Durable construction. 5 3/4"T sits on shelf or desk; sold as a set of 2, one each color combination. Makes the perfect gift for party favors, schools, stocking stuffers, Easter baskets, special needs, promotions and more. Fun for the whole family! (#9A015) Item in stock unless noted above.