Due to protecting the bristles of the brush during shipping, a protective layer of glue has been applied to hold the bristles in place. Therefore, this brush MUST be cleaned with Alcohol or Brush Cleaner AND "shaped (as pictured)" before using. Please do not use acetone to clean the brush. SB acrylic brushes are made with the highest level of quality in materials, such as pure Kolinsky sable hair to ensure durability that soft enough to sculpt and shape to any nail shape and size. Apply acrylic products easily, smoothly and consistently. The more often this brush is used, the smoother effect it will be. Be sure to follow proper brush care tips to extend the life of your brush.