An infusion ladle should be made of a heat-resistant and hygienic material. Most infusion ladles are made of wood or plastic.
Wooden ladles have the advantage that they look very natural and convey a pleasant, traditional sauna feeling. They also absorb the scent of the infusion well, which distributes the fragrance throughout the room. However, care should be taken that the wood is untreated and food-safe to ensure hygiene.
Plastic ladles are usually more durable and easier to clean as they do not absorb moisture and are therefore less prone to mould. However, they cannot absorb and distribute fragrance as well as wooden ladles.
Overall, it is a matter of personal taste and preference which material you prefer. However, it is important that the infusion ladle is hygienic and heat-resistant.