I have all 3 of the Coiltek coils for my sdc the 14x9 is my go to coil although last time out I used the 10x5 as the area was very rocky and the 10x5 poked into spots much better than the others you cant go wrong with any of them just need to work out what conditions you will be detecting in also the stock 8inch round coil very good as well cheers muk.