Hacki Do Mount&blade What Are The Mini Soccer Balls For?

What are the mini soccer balls for? - hacki do mount&blade

http://www.footlocker.com/footlocker/index.jsp?pageId=flkPDP&Slot1.atgProductId=0019901&SlotId1=flk_frg_1229&templateId=flkMensSearchResults&sellable=true

thats a link to what I mean. If you should help their football skills in juggling, it really works? Is it just like a sack of hack? Is it worth buying?