This is off topic so maybe we should delete from this thread?

Well I sell risers on Amazon...  I have 6 packs of risers in stock at Amazon now. With free prime shipping.

In my opinion, green version 6 are best. Black version 6 were good but the factory started making them in a hurry and we started seeing a lot of defects. Blue version 6 I have no personal experience with but a friend fried one in high temperatures.  Same guy that recommended we switch from black to green.

Red version 7 appear to be made by the same factory that makes black version 7. You can see similar qualities in the way they are built.