****parts only*** CERROPI Large Newtons Cradle Pendulum with 7 Balls, Physics Perpetual Motion Desk Toys for Office, Calm Down Fidgets, 50+ Sec Swingtime (Beech Base)

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• 【SCIENTIFIC DESIGN】-CERROPI newton's cradle adopt scientific design,keep the pendulum balls perfectly lined up,make it possible to swing 50s+. Perfect demonstration of the scientific law of momentum conservation and energy conservation
• 【SUPERIOR QUALITY】-Our newtons cradle made of 8mm chromed metal steel bar, 20mm steel Ball,high-impact nylon, ultra-thin nano technology provide extremely durable oscillatory support, durable for long time use.Pursuit of craftsmanship spirit inspired us to continuously produce high-quality goods
• 【WIDE APPLICATION】-This newton balls can be used as office desk gadgets toys to relieve stress; as teaching aid,teaching science intuitively; as toys for family activities, to inspire your child's creativity
• 【EXQUISITE PACKEGING】-We use individual wrapping paper to protect each ball and secure it in foam shockproof material,Perfect for Christmas gifts, Thanksgiving gifts, birthday gifts,Mother's Day gift,Father's Day gift,Valentine's Day gift etc.
• 【WARRANTY & NOTICE】- 1 YEAR warranty, If any piece breaks we send replacement balls, strings and plug to you. Messages reply within 12 hours. NOTE: clean the ball thoroughly before using for the longer swing time,one extra ball and a silky soft cleaning cloth are included in the package