These Selenite (Satin Spar) towers - each sold separately - have many uses but is often used to cleanse the environment or absorb and remove negative energy from other crystals with contact as well as a home decor piece on a light base Approximate Measurements - ~6cm x 3cm (small) & ~11cm x 4.5cm (medium) Selenite or Satin Spar is a variety of Gypsum composed of Calcium Sulfate Dihydrate. It is traditionally used for clearing energy, ridding of negative energy and promoting a calm environmentA larger twin tower is available here.Additional uses for Selenite: Protecting the HomeSelenite sticks or towers placed near doors and windows can protect your home from negative energy from being able to enterBalancing and Calming Emotions- Hold a piece of Selenite to calm and centre yourselfAmplify Energy of Other Crystals- Place a piece of Selenite on a crystal to amplify their energy- Alternatively, place crystals on top of Selenite to deliver both high energy from the stone and soft energy from Selenite, e.g. Amethyst, Celestite, Moonstone, or Labradorite