Set of NY Central Oasis line of watercolor brushes.  They are synthetic and handmade in Germany.
I bought them new, but barely used them.
The 1/2 inch flat brush is a bit bent, but it just needs reviving in hot water...I inadvertently had it in a box with the bristles too close to the end! Please see photos.

Shipping Priority Mail.
I have other things for sale and could combine shipping if possible (if things fit into the boxes I have).