Nephrite is the most expensive and highest quality material for yoni eggs. Nephrite jade is denser and totally different to xiyang jade.This comes with a jute gift bagCan be used to heal and tone yoni strength. You start with the larger size and work down.Yoni egg helped me to regain strength post operatively. I suggest you cleanse before using in salt water overnight. Use silk string for your yoni egg. Store safely in the jute gift bag provided.Large approx 6 cmMedium approx 5.5 cmNo returns on these intimate items.