Foonii Drink or Bottle Straw Stainless Steel Cleaning Brush Kit ( 4 PCS ) GENERAL DIMENSION--Length and Bristle diameters (mm) : 210*7 mm, perfect for most of Drink Straw. HIGH QUALITY STAINLESS STEEL AND SOFT NYLON BRISTLES--Made of 18-8 food grade stainless steel wire, Durable but soft long nylon bristles for cleaning GOOD LENGTH AND DIAMETER--Good length, they can be used to wash strawbucks AND YETI 30OZ longest straws. good diameter, so they also fit big smoothie straws. the smallest size can used with keyboards, chips and so on. FEATURE--They Won't Fracture, Rust , Break AND Durable . Each end of the brush has conservatory design. Not only prevent scratching the items, but also protect you from hurting yourself when cleaning. SAFE--No Chemicals, No BPA, No Phthalates!