Every crystal in this sleep bracelet has the following benefits: Rose Quartz calms the mind and provides sound sleep. Black Obsidian transforms negative energy which clears the mind and heart of chaos. Selenite represents an exemplary mindset which provides better sleep. Smoky Quartz grounds the mind and protects from nightmares. Amethyst mitigates stress by reasserting boundaries. Labradorite abolishes fear and worry that disrupt sleep. Product Dimensions: Beads Size-8mm, Beads-25, Weight-18 grams Please customize your size chart in the order note. Product Size  8mm Avoid using or exposing selenite crystals to water. Please note: You will receive one crystal similar to the ones photographed. Photos show typical quality. Each and every crystal is unique.