gloglow newtons cradle balance balls, led light up pendulum balls physical stress relief toy for home office desk ornament gift(battery not included)(s) gloglow specification:<br>item type: pendulum ball decoration battery: 4 x aa battery(not included) <br> optional style: s ball with black base, m ball with black base <br>s size: approx. 12 x 12 x 9cm / 4.7 x 4.7 x 3.5in<br> m size: approx. 15 x 11.5 x 15cm / 5.9 x 4.5 x 5.9in <br> <br> package list:<br>1 x pendulum ball decoration