PRODUCT SPECIFICATIONS Material of frame: chromed metal Material of ball: bearing steel Number of the ball: 7 (Need more balls?Just get in touch with us!) Soft cleaning cloth is contained in elegant and sturdy packagingOUR GUARANTEE We are responsible for every item we produce. Each Newton's Cradle is carefully hand-crafted and comes with a 12-month warranty. If you have followed the setup instructions contained in the package and cleaned the balls before first use, your cradle must be available for three to five years. If any part is broken, we will send you new replacement balls, strings and plug to you. RETURNS If your product has been damaged during shipping and handling, please log in directly to your account, click on "My Orders", select your Newton's Cradle, then select "Return Item". Since Amazon is responsible for our warehouseing and transportation, we cannot always guarantee that the product will arrive in good condition, and please contact with us if Amazon ignore. CARE & MAINTENANCE Before using cradle, it's important to thoroughly clean the balls with the cloth provided. During manufacturing and shipping, almost invisible barely dust collect on the balls, which affects optimum impact time. A soft cleaning cloth is provided for you in the package. ABOUT CERROPI We're a family-run business who specialize focus on manufacturing Newton's Cradles. We've been selling online for 8 years, and we are committed to improve and become excellent in both quality and customer service.