He aha ke aniani ʻano S?

ʻO ke aniani ʻauʻau S-like, pono ke aniani i ka ʻoki ʻana i ka wai S shape, ka mīkini edging maʻalahi a me ka polishing.
Hoʻohana nui ʻia ke aniani Shower S-shaped 6mm, 8mm a me 10mm