Made of organic bamboo. These have a basic handle and medium to firm bristles and are a good option for people on a budget.
Bamboo is a strong material that is naturally bacteria-resistant and therefore does not easily get mouldy.
The bristles are made from Nylon 4 which naturally breaks down in a few months. According to research, Nylon 4 breaks down in seawater by 80% after 25 days.