Product details:

• The PRO Precision Gel Eye Liner Makeup Brush has ultra-thin slanted flat angle bristles made from high-quality synthetic bristles.
• The Etercycle Eye Liner brush has a stainless steel tip and is made of high-quality nylon that is durable, smooth to the touch, soft, and ductile.
• The SEPHORA COLLECTION PRO Eye Liner Brush #22 has an ultra-thin, angled liner brush with a firm, tapered point for precise and polished lining of the eyes.
• The e.l.f. Cosmetics Flat Eyeliner Brush has synthetic bristles that are 100% animal hair-free and can be used with powder, liquid, or cream products for a flawless lined eye.

Positive:

• The PRO Precision Gel Eye Liner Makeup Brush is cruelty-free and can deliver the finest and most precise lines, even in the tightest, smallest, and hard-to-reach areas of the eyes and lashes.
• The Etercycle Eye Liner brush is durable, smooth to the touch, soft, and ductile.
• The SEPHORA COLLECTION PRO Eye Liner Brush #22 has a firm, tapered point for precise and polished lining of the eyes.
• The e.l.f. Cosmetics Flat Eyeliner Brush is cruelty-free and can create precision lines for instant definition.

Negative:

• There are no negative aspects mentioned in the search results.

Ingredients or materials:

• The PRO Precision Gel Eye Liner Makeup Brush has synthetic bristles made from the highest quality Synthetic Bristles.
• The Etercycle Eye Liner brush has a stainless steel tip and is made of high-quality nylon.
• The SEPHORA COLLECTION PRO Eye Liner Brush #22 does not have any information available about its materials or ingredients.
• The e.l.f. Cosmetics Flat Eyeliner Brush has synthetic bristles that are 100% animal hair-free.

Note: None of the search results provide information about the ingredients or materials of the eyeliner brushes, except for the e.l.f. Cosmetics Flat Eyeliner Brush, which has synthetic bristles that are 100% animal hair-free.