Detachable brush head that can be removed and stored inside your brush pen body. Use with your favourite inks for brush lettering or painting. - Easy to store: protect the brush by storing the tip inside the barrel - Easy to clean: holes in the sides enable thorough rinsing of ink absorbed into the bottom of the brush. - Brush Tip Maintenance; if the tip of the brush becomes jagged, dip in hot water (60℃~80℃) for 1 - 2 minutes, and rearrange back into a neat tip.