MULTIPLE SIZE » Set includes 4-piece 7.8" x 8 mm straw brush and 4-piece 7.8" x 10 mm straw brush. Overall length: 7.8", Bristle Diameters: 8 mm, 10mm. 7.8" length with 8 mm and 10 mm diameter sturdy brush head, reaching the entire inner surface of the straws and pipes for a thorough clean. 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 straws you have and they do not scratch the inside of straws. MULTI-PURPOSE » Not just for cleaning straws, convenient for cleaning Pipe, Tube, Hookah, Coffee Pot, Sink Drain, Hummingbird Feeder, Pet Water Fountain and other hard to access corners. Also can be used for straws on various drinkware like Tumbler, Sippy Cup, Baby Bottles, Tervis, CamelBak, Hydroflasks, Yeti, Starbucks Cup and others. REUSABLE AND WASHABLE » Top Rack Dishwasher Safe. Handiest tool for reusable straw owners, do not worry about rinsing, the brush is dishwasher safe. RISK FREE » 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. Finally, you can clean those stubborn skinny straws, bottle necks, bud vases and tubes to your satisfaction with the slenderest of brushes. Long nylon brush efficiently glides into narrow openings for a thorough clean.