tcm
...
duz anyone kno what these are called? They aren't the big 2 inch squarish ones and nor are they the navionics garm ones with metal on one side - they plastic black and are about 1.5- 2cm max in one direction and 1 - 1.5 cm in the other only a few cm thick and trapeziumish shaped in cross section so you can only puttem in one way.
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