Various Sizes: This cleaning brush set includes 5 pieces 12 x 13mm brushes for any smoothie straws, boba straws, milkshake straws. 5 pieces 10 x 10mm brushes for any regular size reusbale straws, tumbler straws. 5 pieces 8 x 7mm brushes for baby bottle straws, kids tumbler straws. Food Grade Material: 18-10 Food Grade Stainless Steel, Durable But Soft Long Nylon Bristles. Sturdy and flexible cleaning tool, effective straw cleaners to clean each size pipes you have and they do not scratch the inside of straws. Multi-purpose: Not just for cleaning straws, convenient for cleaning funnel necks, tubes or cylinders and other hard to access corners. Also can be used for various drinkware like Tervis, Yeti, and others. Convenient and Easy to Clean: Top Rack Dishwasher Safe. Handiest tool for reusable straw owners, do not worry about rinsing, the brushes are Dishwasher safe. Customer Service: 100% brand new and BPA free. Hiware always do everything we can to ensure our customers are happy, any suggestions from our valued clients are welcome.