bought a 15 dd off Stinky Pete for my 3500 , only used it twice; no gold; but depth on tiny lead is awesome, recently upgrade to a 4000 and it came with the elliptical mono must be around 15 x 8 and its dynamite on small lead at good depth ; again no gold but only used it twice , didn't try the 15, was so impressed layed up at the moment with a mini hip replacement,but took 8 weeks off work so when good to go will hit the Castlemaine area for a couple of weeks and hopefully have some pics to share