This acrylic brush has been pinched to create a more flat belly which aides in moving the acrylic across the nail. The bristles are all natural Kolinsky fibres meaning they will work well with monomer and hold their shape brilliantly in a way that synthetic could not.
Please note that the brush paint is not resistant to acrylic liquid, therefore no acid or oil based should be in contact with it as it can cause it to melt. The paint will dissolve in acrylic liquid, acetone or brush cleaner. You have to make sure that the brush handle is free from any liquid. For this reason, we always suggest to not let brush cleaner or acrylic liquid go over the metal bit.