Stainless Steel Bands

They can be found on amazon as Hose Band or Stainless Band (Make sure to get the right size for shakuhachi!)

A set of five steel bands adjustable from 25mm to 40mm in diameter for holding split bamboo together before it can be repaired with string or rattan. Dampen bamboo with a towel before applying bands, and put a cloth in-between banboo and bands so that the bamboo does not get scratched. Use with the nut driver.