Hi all I just bought a 9 X 8 concentric coil from a member on the forum. I am going to put it on my Silver uMax, I really like the stock round brown coil but have always wanted to try the 9X8 coil on it. Not that my Silver uMax is heavy but I think it will be even lighter with the spoked coil and might get a hair more depth??? I will let you all know how it works out when I get it. Thanks! Steve.