The materials and the shapes of the open-air baths in your room can be grouped mainly into two types.
【Wood】Rounded barrel bath
Oborozuki / Aoi Tsuki / Katta-dake / Nazuna / Nanohana / Ito-tombo
【Stone (Mainly made with Towadaishi】Squared bath
Mikazuki / Eboshi-dake / Byobu-dake / Sugi / Momiji / Tsumekusa(Semi-open-air bath) / Mizutama / Mizumari