Here are the details, positive and negative aspects, and ingredients or materials of some highlighter brushes based on the search results:

1. e.l.f. Highlighting Brush:

• 100% vegan and synthetic bristles
• Positive: cruelty-free and vegan
• Negative: no negative aspects found
• Ingredients/materials: synthetic, vegan fibers

2. Seraphine Botanicals V6 Precision Highlighter Brush:

• 100% PETA-certified cruelty-free and vegan
• Positive: cruelty-free and vegan
• Negative: no negative aspects found
• Ingredients/materials: no information found

3. ROSE INC No. 6 Highlighter Brush:

• Soft, extended bristles to deposit the right amount of product for a radiant finish
• Positive: no information found
• Negative: no information found
• Ingredients/materials: no information found

4. La Bouche Rouge Highlighter Brush:

• Large brush made of beech wood and vegan fibers to apply la Lumière
• Positive: cruelty-free and vegan, made of beech wood and vegan fibers
• Negative: expensive
• Ingredients/materials: beech wood and vegan fibers

5. Rephr Brushes:

• Handcrafted in Japan
• Positive: no information found
• Negative: no information found
• Ingredients/materials: no information found

In general, highlighter brushes are made of synthetic or vegan fibers to ensure that they are cruelty-free and vegan. Some brushes are made of beech wood, which is a sustainable material. The positive aspects of highlighter brushes are that they are cruelty-free and vegan, while the negative aspects are that some brushes can be expensive.