The VALLEJO HOBBY BRUSH - DETAIL SYNTHETIC ROUND BRUSH No. 4 is a round brush with synthetic fibers, designed for detailed painting and modeling. It's a versatile tool suitable for various models and miniatures, offering precise and smooth strokes. The synthetic fibers are chosen for their excellent performance and durability, allowing for optimum paint load and control. 

Here's a more detailed breakdown:

• Synthetic Fibers:

  The brush is made with synthetic fibers, which are known for their ability to hold and release paint well, making them suitable for various types of paints. 

• Detail Work:

  The brush's round shape and size are ideal for detailed painting and outlining. 

• Versatility:

  It can be used for both large surface areas and fine details, making it a versatile tool for modelers and artists. 

• No. 4 Size:

  The "No. 4" designation refers to the size of the brush, which is a medium size suitable for a variety of applications.