Size Diameter:Approx--Small size 5 inches;large size 12 inchs.Perfect size suitable for various designs.Double-sided:Elegant appearance,follow simple-style,fresh and natural without losing color which bring you not the same artistic experience,and you will feel particularly calm and relaxedHigh Quality:High transparency glass as clear crystal as the water drop allows you to fully enjoy the beauty of quicksand.Carefully screened sand,colorful,levels clearly demarcated,flow out of the pattern of 3D effect is excellent.Applicable:Moving sand pictures create a new sand picture with each turn.Looking at the ever-changing sand flow,to relieve stress,it's good effectiveness of the release of eye fatigue,especially suitable office workers,students,long time in the computer next to the work of people. NOTE: Since the light and screen's difference, there be slightly color different.Creative Gift:Mobile sand is exactly artcraft you use to decorate your home or officeIf you have a hard time buying for yourself,your friends or family,you could buy one of these sand art pictures to enjoy