These blooming ben wa balls are ideal for kegel exercises, giving those muscles for more control and sexual sensation. Prisms' Erotic Glass benwa balls are also ideal for exploring your sensual side. Featuring two glass benwa ball spheres that are weighted perfectly for the conditioning aspect of your kegel exercises. Simply insert the ben wa balls and enjoy the smooth, slick feeling as they create a gentle resistance. Unfold yourself into a blissful experience! The benwa balls' borosilicate material is durable, non-porous, allergy safe, and suitable for use with any type of lubricant. You can even keep them in during intercourse for a whole new range of exciting and stimulating sensations!