DSI Exclusive 5L Gel Extension Brush. Professional oval gel extension brush. Synthetic bristles. The DSI Exclusive 5L gel extension brush is a professional tool designed for gel nail extension. The brush is equipped with a synthetic bristle, which ensures precision and flexibility in work, and allows the beautician to create a smooth and precise texture on the surface of the nail. The brush is designed to meet the high demands of nail experts, and provides maximum comfort during use, which makes it easier to create an aesthetic and uniform look.