One of the most important or perhaps ‘the’ most important tool for a thangka painter is a good brush for pulling lines. Wether you are inking a drawing, pulling coloured lines on your painting or applying gold motifs, a good brush is indispensable. I have used many different brushes in my painting career but I keep falling back to the Chinese brushes that I used to use when I started studying.
Apart from the Chinese brushes the one that I would highly recommend to thangka painters and especially beginners are the ‘Winsor and Newton’ series 7 brushes (sizes #0 and #1)
I personally prefer using brushes with natural hairs rather than synthetic ones because the synthetic hairs often tend to split after some time. Here are some links to brushes that I use regularly.