Features: 100%?Brand?New?and?High?Quality Not?only?demonstrates?a?pendulum，?but?also?shows?the?Laws of?Conservation?of?Momentum?and?Energy. Friction?and?damping?effects?are?also?observed. Often?used?as?a?toy?to?amuse?people. Includes?steel?balls，?plastic?frames?and?base. Great?gift?for?everyone. Specifications: Size:?87x75x95mm(LxWxH) Net?weight:96g Color:Wine?red+Silver ? Packing?content: 1?x?Balance?Balls?Desk?Physics?Science?Pendulum?Desk?Toy