Page "Fishing rod" Paragraph 36

The most effective use in bass fishing are IM and Modulus rods when one is using lures like worms and jigs.

When using faster lures, such as spinnerbaits, and crankbaits, the fisherman does not need to have the sensitivity needed when using the slow lures.

The theoretical reason for a more sensitive rod when using a slower lure is that many of the strikes ( or more gentle " pickups ") will be harder to feel with a rod of a lower modulus rating.