Rimba guarantees you the best latex material available. This product has a massive core and can be inflated by squeezing the balloon pump. Releasing air is easy by pushing the press button on the valve.Protect the quality of this article by keeping it away from UV and Sunlight. Thorough cleaning before first use and after every use.Use proper lubrication for extra comfortable use.Core SizeNormal 5.2cmInflated 9.0cm