They have a ball bearing swivel and a 4/0 hook. The 1/4 and 3/8 oz. models have a #3 nickel blade. The 1/2 oz. has a #3.5 nickel blade.
Spanker Jigs™
Black Sahara - Herring Head Underspin Hair Jig
Florida Ain't For Sissies
Skirted Weedless Casting Jigs
Spinnin' PJ - Matt Arey Signature Underspin – Pulse Fish Lures
Pulse Fish Lures Underspin
Minnow Head Bucktail Jigs
Underspin Jig — Junk Fishing Lures
Meathead Live Bait Jig - Pure Tungsten – Fish Frostbite USA
Florida Ain't For Sissies