EASY TO CLEAN - you can clean with a rag and water. it's an ideal decoration for your fish tank with this lifelike ornament. HOW IT WORK-an air pump and 3/16" tube (not included) and an air valve(not included) are needed to control the of the air to the skeleton, then you can adjust its swing frequency and range. HIGH SIMULATION-phantom pirate appears to be moving the wheel when you connect to the air pump and the bubble rises. COMPACT SIZE-if it's too light to float up, you can use the two bottom black plates to jam or press it with stones. PREMIUM MATERIAL-made of premium resin and plastic, , non-toxic and pollution-free, absolutely safe for your lovely fish.