What are these black rubber rings on my new icefishing rod's tag

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What are these black rubber rings on my new icefishing rod's tag

New Wacky Neko Rings give you perfect hook placement and prolongs the life of your soft plastics, giving you more options for your rig. Designed with durability in mind, Mustad has introduced the new standard in toughness for Neko rings.

Mustad Offset Wacky Neko Rings