Hollow Gold balls

hi all,

I am looking for this balls mentioned in Ganoksin website as below:

Hollow ball

Machines are available for forming strip into hollow balls which can
then be used in a variety of jewellery components including
hand-made chains. Balls from 1.5mm to 10mm diameter can be produced
at rates of up to 200 per minute, the balls being formed
progressively in a simple press tool.

Can anybody give me some more details on this? From where I can get
this type of machines??

I want to know more about this product, this should be not be any
hole on the surfaces but hollow inside.

Please reply me soon! If anybody have idea.

Thanks and Regards,
Rajesh Pichholiya