Moon Evolution Crystal Holographic Acrylic Keychain / Anime / Nostalgia This is one of 9 different crystals that you can collect to adorn your backpack, purse, etc. Do you have a favorite? It features an easy to use clasp and is partially transparent to replicate an actual crystal. I'm so excited to finally have these in hand! It took a while to illustrate and produce them all, but I'm very pleased with the end product! I hope you like it too! Specifications: ~3.5 inches at longest length Double Board Double Side Holographic on one side