The Rose Quartz Roller attachment head is designed for use with your GloPRO tool to apply oils, serums, and creams. The stone feels cool to the touch, but can be chilled further by submerging it in cold water or placing it in the refrigerator, or heated by placing it in warm water to heat the stone for a relaxing sensation.How do I use it: Attach head to GloPRO tool (not included). Gently guide in horizontal, vertical, and diagonal directions to maximize skin stimulation.From BeautyBio.For use with GloPRO tool, not includedRose quartz construct