CB30S

It's designed for cleaning 3-inch lines.

Soft construction like what you've got here works best when lines have bends, offsets, or other irregularities that a stiffer ball might hang up on. The material gives a little as it moves through, so it keeps going where a harder ball might stall. For routine upkeep where you're not trying to break loose heavy buildup, the soft version is usually the right call.

Soft material helps it navigate bends and irregularities more easily, so it is a good fit when the run is not perfectly straight.