A Brow Tool: Sonia Kashuk Essential Brow Line + Fill Makeup Brush With Spoolie This double ended Sonia Kashuk Essential Brow Line + Fill Makeup Brush With Spoolie ($5) is an essential. Use one side to fill in your brows, and the other side to brush them up and set them in place. Image Source: target.com Sonia Kashuk Essential Brow Line + Fill Makeup Brush With Spoolie $5 from target.com Buy Now