These are earrings that contain a micro circuit powering LEDs to create a firework effect on one side. Each order comes with a set of batteries so you'll be ready for hours of fun. The earrings are very light weight, each earring weighs less than a penny! (With battery) Cases are available if you want to take your earring on the go! When making these I selected high quality components such as, Cree brand LEDs, for superior brightness, and Texas Instrument's IC for great battery life. When I say "Made in Ohio", that means that these earrings were completely designed and assembled in Ohio by me! I designed the circuit board using CAD and EDA programs, had the bare PCB made by a company, then I assembled all the parts myself, and I package them myself. This project has been in the works for over 8 months, has gone through 6 prototypes, and countless hours of research. I hope the end product is not a disappointment! If you plan to use it for more than the rated 8 hours then grab a few packs of the CR1220 batteries with your order. Stainless steal hooks included. (If you want a different color hook just send me a message and I will let you know what other options I have in stock. I usually have Gold and Black) Earring material is PCB or printed circuit board. It is gold plated, uses lead free components, solder, and cleaning materials.