I must say I am extremely impressed with these brushes. My friends already call me a Storz and a bickle Fanboy as it is, and the fact I have multiple of these brushes does not help my case at all. I believe the bristles are made from Boar hair, yeah I know right, the big oinkers ❤️ the hair is heat resistant and means if you end up with some touching a hot surface like a bowl or oven on a Vaporiser it doesn’t burn and doesn’t smell either. The wooden end works well to scoop gunk out of my oven or glass stems. I think I’ll order some more because they are so handy. Thank you guys for the fast shipping and well packaged product ❤️🙏