White Quarz has a very strong cleansing and cooling effect and it can easely be charged up. Dont forget to clean the stone energetically as well.
The egg has a hole drilled through it lenthwise. It comes with a small bag and instructions for use. The books “Tao der Frau” and “Exploring the Hidden Power of Female Sexuality” by Maitreyi D. Piontek contain further information on how to use the energy-egg.