Feature:2 TYPESThere are two products for you to choose, TypeA is Perpetual machine ornament, TypeB is Perpetual machine which is powered by 1 x AA battery(not included), showing Kinetic art.STURDY MATERIALKinetic perpetual motion ornament is made of wood, perpetual motion is made of wood+plastic,solid wood base, non-slip. The base is polished smooth and won& 039;t scratch your desktop.SCIENTIFIC TOYPerpetual motion device shows pendulum motion, it helps to show the laws of conservation of momentum and energy, lets you experience the visual display of momentum, and arouses your interest in science and physics.NICE DESKTOP DECORThis creative desktop decoration is scientific and simple, a dynamic art, an ideal decoration for your home, bedroom, living room, study, and office. It also helps you relieve stress.GREAT GIFTThis perpetual motion machine makes the ball loop indefinitely, it is fun and practical. It is an excellent gift for kids, friends and family on birthdays, festivals or anniversaries, both as a nice decoration and as a fun toy.Specifications:Type: A(WoodenPerpetual machine ornament), B(Perpetual machine)Color: Red brownTypeA material: WoodTypeB material: Wood+plasticTypeB power by: 1 x AA battery(not included)TypeA size: About25 x 10.5 x 22cm/9.84 x 4.13 x 8.66inch(L x W x H)TypeB size: About 22 x 12 x 20cm/8.66 x 4.72 x 7.87inch(L x W x H)Package Includes:TypeA:1pc x Perpetual machine ornament4pcs x Iron BallOrTypeB:1pc x Perpetual machine5pcs x Iron BallNote:1. Due to the light and screen difference, the item& 039;s color may be slightly different from the pictures.2. Please allow 0.5-2 cm differences due to manual measurement.