Bdellium Tools Pink Bambu series brushes are professional eco-friendly makeup brushes with all sustainable bamboo handles and all vegan soft synthetic bristles with an anodized aluminum ferrule. Bamboo is one of the most sustainable resources and environmentally sound plants on Earth. Due to its rapid re-growth cycle, it can be harvested with virtually no impact on the environment. All of the soft synthetic filaments used in the Pink Bambu series are not treated with an antibacterial agent. The advantages of synthetic bristles includes less or no hair shedding compared to natural bristles, it is easier to clean and provides a light application. The synthetic bristles are hypoallergenic and 100% cruelty-free.