Kai Lun Qu 6-Piece Trekell Brush Set for Oil & Acrylic Painting

Curated by Trekell Pro Team artist Kai Lun Qu, this 6-piece brush set brings together Long Flat brushes from our Opal, Legion, and Spectrum collections, giving artists three distinct brush responses within one versatile shape.

Kai's selection is built around the Long Flat, a shape that combines the clean edge of a traditional Flat with longer bristles for increased paint capacity, flexibility, and fluid movement. By pairing this shape with three different synthetic filaments, the set allows artists to change how they move, blend, and manipulate paint while maintaining the familiarity of the same brush profile.

Trekell's premium synthetic brushes feature blends of varying filament diameters with carefully tapered tips designed to more closely mimic the performance of natural brush hair. Unlike lower-quality synthetic brushes made with uniform, blunt-cut filaments, this construction provides improved paint pickup, smoother paint flow, and more responsive handling.

6-Piece Brush Set Includes

Opal Synthetic Hog Bristle

• (1) #2 Opal Long Flat (4000LF-2)
• (1) #4 Opal Long Flat (4000LF-4)
• (1) #6 Opal Long Flat (4000LF-6)
• (1) #10 Opal Long Flat (4000LF-10)

Legion Synthetic Mongoose

• (1) Legion Long Flat (9100FL-4)

Spectrum

• (1) #6 Spectrum Long Flat (3000LF-6)

Why These Brushes Work Together

The Opal Long Flats form the foundation of Kai's set, with four sizes that allow artists to move between smaller controlled passages and larger areas of a painting. Opal's firm synthetic filament is engineered to mimic the strength and stiffness of natural hog bristle, providing the resistance needed to push heavier paint, build texture, and create confident, intentional strokes.

The Legion Long Flat introduces a more responsive, medium-to-soft feel. Its synthetic mongoose filament provides spring and subtle texture, making it excellent for moving and shaping paint while creating controlled blends and transitions.

The Spectrum Long Flat provides the smoothest response in the set. Its exceptionally smooth synthetic filament promotes even paint release and helps minimize visible brush strokes, making it ideal for blending, softening transitions, and creating more refined finishes.

Together, these three filament types allow artists to move from firm and assertive paint handling to softer blending and refinement without changing the fundamental Long Flat shape.

Why Artists Choose the Kai Lun Qu Brush Set

• Six brushes selected around Kai Lun Qu's painting practice
• Combines Opal, Legion, and Spectrum synthetic brushes
• Long Flat shape throughout the set for a consistent brush profile with different filament responses
• Four Opal sizes provide versatility from controlled passages to broader applications
• Three distinct levels of firmness and paint handling
• Blend of varying filament diameters for a more natural, responsive brush feel
• Carefully tapered tips for improved paint pickup, flow, and control
• Thermyx™ filament technology provides built-in shape memory and longevity
• Synthetic and vegan-friendly materials
• Long handles provide balance, reach, and freedom of movement
• Designed for oil and acrylic painting

Built to Last

Each brush is made with Trekell's Thermyx™ filament technology. During manufacturing, the bristles are heat-set to create built-in shape memory that helps the brushes maintain their edges, shape, and performance over time.

If the bristles begin to lose their shape, dip them in simmering water for a few seconds to help restore them closer to their original form. Reshape the bristles while warm and allow them to dry in place.

For even longer-lasting performance, apply Trekell Brush Restorer while the bristles dry to help them hold their shape between painting sessions.

The Kai Lun Qu Brush Set gives artists one versatile shape with three distinctly different brush responses: the firmness of Opal, the spring and subtle texture of Legion, and the smooth refinement of Spectrum. It's a streamlined collection designed to give you more control over how paint moves across the surface.