PRODUCT SPECIFICATIONS Frame material: 8mm diameter of chromed metal steel bar Ball material: bearing steel, diameter of 20mm Dimension:L230*W170*H170(mm) Ball count: 7 (more can be added upon request - just get in touch!) Silky soft cleaning cloth included in elegant, discreet packaging OUR GUARANTEE We stand behind every single product we manufacture. Each Newton's Cradle is hand finished with care and comes with a 12-month warranty . If you have followed the setup instructions to clean the balls before first use, then your Cradle is sure to last for three to five years. If any piece breaks we send replacement balls, strings and plug to you. RETURNS If your product has been damaged during and shipping and handling, please get in contact with Amazon directly by logging into your account, selecting your Newton's Cradle, then selecting "Return Item". Because Amazon handles our storage and shipping, we cannot always guarantee that a product will arrive fully in tact, and contact with us if amazon ignore. CARE & MAINTENANCE It's important to clean the ball thoroughly with the cloth provided before using the Newton's Cradle. During the manufacturing and shipping process, barely perceptible dust can gather on the balls, which hinders optimal impact time. A silky soft cleaning cloth is provided for you in the packaging. ABOUT CERROPI We're a family-run business who specialize solely in manufacturing Newton's Cradles. We've been selling online for 11 years, and are committed to excellence in both manufacturing and customer service.