Soft sponge not making any damage to a nipple
Long size and narrow handle easy to wash
Washable small and stubborn dirt from a nipple

Straight wash
Holding both handle and knob at the same time and wash bottlekai
by pushing and pulling brush by not rotating brush.

Knob helps to hold brush firmly for straight wash
Brush can wash bottle every nook and corner
High density brush can clean easily stubborn dirt at the bottom