1. About the set - It is made up of Acrylic Single Flared Stretch Rods, Bone Rods, and Silicone Double Flared Flesh Tunnels.^2.High Quality Materials: High quality silicone and ultra light acrylic, so you can wear without pressure. And it's very durable. The ultra-thin design is extremely tailored to the human body so that you are not allergic. The soft material adapts to the ear and is barely noticeable. It is also absolutely safe for allergy sufferers.^3.Unique design: with ultra-thin silicone, you can wear it while you sleep. Doesn't harm your ears, and it's held in place with two O-rings and won't fall.^4. About the set - It consists of Acrylic Single Flared Expanding Bars, Bone Rods 1.6mm-12mm, and Silicone Double Flared Flesh Tunnel3mm-12mm. Be careful, expanding rods and bone rods do not contain 12mm^5. The benefits for the ears - The ultra-thin silicone material gives it good skin tolerance, so you can wear it while sleeping without pressure. It adapts to the ear and is barely noticeable. It won't harm your ears.