That is a gamagatsu weedless hook.
Academy carries them in some stores.
this exactly ..... Academy / Bass pro Shops / Donald Harper
I have been using them for 4 years to fish wacky senkos and trick worms
I use the 3/0 and the 5/0
I use a clam weight (different sizes) crimped on just above the knot to produce different fall rates for the wacky worms.
I also use them on my flukes when I am fishing in grass --- also with clam weights (or weightless)