Fixit
Well-Known Member

Yozuri Diving Board K Type with Tread
Yozuri Diving Board K Type with Tread The Yo-Zuri Dive Board K-Type is ideal for upper and middle depth trolling. It provides a wobble action which gives the lure lifelike movement. When a fish takes a lure, the board flips over and is driven up by water resistance. Used commonly for the tuna...

these are what you want. I found some on amazon too