Inflatable Plug with a massive core This product has a solid core and can be inflated by squeezing the pump of the balloon. To release air again, turn the valve of the pump. Protect the quality of this product by keeping it away from UV and sunlight. Clean thoroughly before first use and after each use. Tip: Use a good lubricant for extra comfortable use. The solid core is inflatable from Ø 4.7 cm to maximum Ø 8.5 cm. In height, the core is inflatable from 7.4 cm to 15 cm.