Noun
casting weight (plural casting weights)
A weight that turns a balance when exactly poised.
Spinning rods 26.4 in. (67cm) long pike caught on an ultra-light spinning rod (5 grams casting weight) using a 1 in. (25mm) spinner bait. Source: Internet
When a cast weight is slightly less than the specified casting weight the distance is slightly reduced as well, as the rod action is only used partially. Source: Internet