MATERIALS: These mini vials are made of borosilicate glass that features excellent chemical-resistance, thermal properties and clarity. PROTECTS YOUR LIQUIDS - Plastic black caps seal tight to prevent any leakage. Each bottle holds up to Capacity:5ml. EASY TO USE - Every bottle is equipped with a cap. PORTABLE TRAVEL SIZE -The vial is great for storing liquids, powder, seeds, specimen, and small objects etc, take your oils wherever you go. PACKAGE INCLUDES - 20 x 5ml clear glass bottles, effectively store essential oils, vanilla, herbs, spices and so on.