3 1/2" PVC Roach-style glider, foiled with silver BritBack, top coated with Solarez.
30 grams, very slow sink, retrieve in short strokes like a walking bait. It's so short that it will turn 180 degrees on big pulls, and foul itself.
Rate of fall is about 1 foot in ten seconds, but it will go deeper if it's twitched slowly, due to the sloped forehead.
It's my first sub-surface glider, so I'm very happy that it actually walks underwater.