Zukers trolling feathers work well for many trolled species including tuna, dorado, marlin, mackerel and bonito. They are meant to be trolled at about 8-10 knots or can be trolled faster with a trolling lead in front, or behind a bird. They are effective for many species of fish but especially tuna. We have both the medium size feathers Zuker model ZF and large size feather ZTWF.
The ZF is a 6" Lure
The ZTWF is and 8.5" Lure