This is a natural Selenite crystal stick. Each stick/log is 3 inches long.
Selenite is an important crystal to have in your collection. It is great for clearing negative energy and blockages. This include on other crystals.
It is associated with both the Crown Chakra and the Soul Star Chakra which makes it perfect for meditation and spiritual healing.
Selenite is a crystal that can cleanse itself, but you may burn sage or Palo Santo over it if you wish.
Please avoid soaking Selenite in water! It is a soft crystal and can dissolve in water. A quick rinse is more than enough to physically clean this crystal.