There is a video out there showing you how to make it but i cant find it so i found this 1 and i even belive it to be the same people.

Just over 10 minutes to make 1 and then they will charge your as ££££ lol

Very impressed though

Long winded video but worth while watching imho.

Bit makes me laugh is the machine even engraves the company name and details on the block after its done!

http://uk.youtube.com/watch?v=QsmiIeAkE-o