Material: soft silicone and fluorescent powder Diameter: approximately 5 cm. Total length: about 14cm Color: 5 different colors (pink, blue, yellow, green, purple, orange, 5 colors sent randomly) Easy to use: just to fix the suction cup, it is fixed by a thin invisible string. The suction cup should be at the bottom of the aquarium, and the string with the jellyfish should be below the waterline.