Newton Cradle Balls

Newton Cradle Balls 
1) Newton's Cradle is a classic desk toy 
2) Also known as balance balls  the clacking of the balls will keep you entertained throughout the day 
3) Pull back one or more of the balls,release them and the same number of balls will swing up on the opposite side 
4) The balls will click back and forth until they stop. 
5) Metal frame, wood base 
6) Please note, the balls do not swing indefinitely and eventually stop. 
7) 20mm diameter steel balls. 
8) Size: 180x150x184mm 
9) This is the famous law of conservation of momentum 
ราคา 400 บาท 
คลิ๊กดูตัวอย่าง  http://www.youtube.com/watch?v=jid7Nlzfet8 
สอบถามก่อนโอนเงิน  Tel 083-550-8828 นิว