Or three words, TL Power PLaner
These boards are 2 feet long and 16 inches wide, they are weighed by 3kg lead (one 6kg downrigger ball split in two).
The lead is to prevent the boards to lift when fishing in crappy weather.
The boards are "Copies" of otter boards, who again is copy of an very very old Swedish planer board named "Mariestad pulkan".
The TL Power Planer is filled with floating foam, and has a hard moulded outer shell.