This small C cap is cosmetic plastic screw lid with dimension 15.5mm ×16.5mm, designed to match bottles with 10.5 thread mouth, widely used for essential oil sample vials and mini cosmetic bottles. Made of premium PP plastic, the cap is sturdy, lightweight and chemical stable, compatible with most essential oils and skincare liquids. Unique horizontal multi-ring ribbed surface design, increases friction for easier twisting operation. Precision thread processing ensures smooth screwing and tight closure to reduce liquid volatilization and leakage. Various color options in stock. Custom logo service available, including silk screen printing and laser engraving for brand personalized packaging. Ideal matching cap for small sample bottles, aromatherapy vials and mini cosmetic containers. Factory direct wholesale, flexible MOQ and stable production capacity for cosmetic brands and packaging distributors.