The Toysmith Bubble motion tumbler presents the phenomena of liquid dynamics in a fun and soothing display. Flip this bubbler like an hourglass to watch the liquid elements inside squeeze, slip and float serenely to the bottom. This soothing visual display requires no power or mechanical parts, and can provide hours of entertainment. Durable construction withstands constant handling and resists cracks. The 3-1/4"X1-1/4"x6-1/8" Bubblers is ideal for display on a desk or shelf. No assembly required. Comes in various colors. This is not a toy.