The balls themselves are round, weighted spheres with a slick, shiny texture, you’ll need to squeeze and flex the pelvic floor to keep them in place once inserted. If you practice kegel exercises, they’re are perfect for helping you isolate the muscles to work out- a firm, flexible cord helps with removal and manipulation. Once you’ve mastered control of the pelvic floor muscles, you can take things a step further into pure pleasure, since any movement will make the Balls vibrate gently against the walls of the vagina. You can keep them in place as long as you like, even during everyday activities and no one will be the wiser. The hygienic plastic material is easy to clean and sterilize, and it’s completely body friendly.The strand is about 8 3/4 inches long with a bead circumference of 3.9 inches around. Comaptible with any type of lubricant.