Kobayashi Pharmaceutical Soft Interdental Brush, Rubber Type, Interdental Brush, Thin Type, SS-M Size, 80 pieces (40 pieces x 2) Smoothly fits from narrow to wide interdental spaces. Soft feel, gentle comfort. Rubber-type interdental brush that does not use wire, removes food debris and plaque that cause periodontal disease, pyorrhea, and cavities. Available for immediate purchase. Thank you very much.