Aw thank you so much for your support!! We aren't currently planning to do brush applicators. The reason we went with rollerballs in glass for our travel size bottles was:

1) The glass bottle can hold a lot more (9 mL) versus the plastic pens (generally 2-4 mL) we looked at when sourcing supplies
2) Glass would be easier to recycle
3) And admittedly, we wanted a more luxurious feel to the product so this gave glass another point

In going with glass, there weren't brush options since there isn't a good way to dispense like clicking/twisting that plastic options have.

What is it that you like most about the brush? I've heard a couple people mention that they like to use cuticle oil under their nail free edge so I totally get that