Authentic bamboo tubes. A copper plate for water collection is fixed inside. Sizes from largest to smallest: Height 73 cm: Diameter 9.5-10.5 cm Height 54.5 cm: Diameter 9.5-10 cm Height 48.4 cm: Diameter 9-9.5 cm Height 32.5 cm: Diameter 8.7-9.4 cm They create a nice atmosphere when used for flower arrangements or New Year's decorations. As they are natural items, there may be some cracks, but there are no problems with use.