HJ's lnterlon brushes are made with PBT synthetic nylon filament that curves inwards towards the centre of the brush to offer optimum strength and control. This is our premium oil and acrylic line of synthetic brushes. The quality and durability of this hair is remarkable and ideal for painters who are not willing to use real hog bristle brushes. Each brush has applied shape memory and interlocked construction that allows the brush hair to bounce back to the original shape. This line offers durability and precision in painting.