Given the fact that you can for the price (currently just under 8, -) this sets of 2 balls (not the normal version, with the waves) gets even the complete Senses-Bahn, the concept is seen not only ecologically impudence but also rip par excellence. When the parts are at some point for a reasonable price sold (and "reasonable" would be for me max. 3-4 Euro), then gäbs only 2 star deduction, so there are just at the moment 4. Actually, it would be 5, but that's unfortunately not.