You can combine any of the sizes listed below. Please order in units of 50. If you don't see other sizes listed, feel free to ask about availability. 50 pieces: ¥1270 100 pieces: ¥2390 The purchase price has increased compared to before. Therefore, we have had to raise the price. Because the price is set at the bare minimum, we cannot offer a discount. However, we will discount by about ¥150 if you purchase with toothbrushes, floss, etc. Thank you for your understanding. This is an L-shaped interdental brush. 4S: Passage diameter 0.6mm 3S: Passage diameter 0.7mm 2S: Passage diameter 0.8mm S: Passage diameter 1.0mm M: Passage diameter 1.2mm There are many in the package, so you can use them freely. I will respond carefully, so thank you for your cooperation.