Interdental brush is a small toothbrush, effective in helping clean teeth. It can remove tartar and the residues between teeth and the plaque between the teeth that normal toothbrush cannot reach. Prevent bad breath and have prevention of tooth pattern and periodontal patterns. Brush heads have several different sizes to accommodate different tooth spacing. Suit for Adults, especially people who are Orthodonticsorthodontic or root canal treatment. Specification: Material: Stainless Steel Wire + Environmental Protection Plastic Size: Approx. Yellow:0.4 mm / 0.157inch Orange:0.6mm/0.236 inch Pink:0.7mm/0.276 inch Green:0.8mm/0.315 inch Blue:1.0mm/0.393 inch Purple:1.2-1.5mm/ 0.472-0.591 inch Quantity: 22 Pcs Package Includes: 22 Pieces Teeth Cleaning Brushes Note: Size for manual measurement, there may be a 0 to 1 cm error, belongs to the normal phenomenon. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!