Chasen with red string is typically used for celebrations of longevity, and among them one having the knot on its upper part is used for kanreki (celebration of one's 60th birthday) and koki (cerebration of one's 70th birthday) and one without a knot is used for kiju (cerebration of one's 77th birthday) and beiju (celebration of one's 88th birthday).
赤糸の茶筅の代表的なものが長寿の祝い事に用いられる祝茶筅で、還暦や古希では元節、喜寿や米寿では節無しとする。