Gel Brush - #6 The oval design and synthetic fibers are perfect for contouring gels to the curvature of the nail. The Nail Harmony Size 6 Oval Gel Brush is an all black brush with a rhinestone studded body with the Harmony logo to included a rhinestone studded lid to protect against any product curing. This brush is ideal for careful cuticle work in addition to dry brushing and structure gel. This very beautiful brush is a MUST for nail techs wanting a great image with beautifully branded products.