This is a base for an obi pillow. It is not an obi pillow. Two-piece obis without fasteners tend to slip down, so using this will keep your otaiko obi from falling and provide peace of mind. Made of Japanese cypress. Please note that the wood grain will vary. This is a base for an obi pillow. It is not an obi pillow. Two-piece obis without fasteners tend to slip down, so using this will keep your otaiko obi from falling and provide peace of mind. Made of Japanese cypress. Please note that the wood grain will vary.