The metal glass tube holders, which finally solve the problem:
Glass tubes can be exchanged easily to be washed and refilled with water and new flowers.
2 metal legs allow secure placement in floral foams or clay bases or on twigs.
Also easy to be added into dry bouquets.
"Tetsu means "metal" in Japanese.
Length: 39cm
Length holder part: 7cm
Inner diameter: 2cm