Set of 5 Sisal Bottle BrushesA simple guide to use these brushes to clean: 1. the large brush: water bottles (narrow opening brush like S'well bottle), vases, mason jars 2. the medium brush: baby milk bottles or pacifiers, beer bottles, soy sauce bottles 3. the small brush: kettles, cans, jam jars 4. the cotton straw brush: glass steel straws or delicate surface surfaces 5. the sisal straw brush: bamboo straws or surfaces with tough stains A reusable water bottle is far better