4 oz blue boston round glass bottles are available paired with black phenolic cone lined caps. The glass boston round bottles are impermeable and nonporous, preventing any product interaction and helping to maintain freshness. These 4 oz glass bottles also feature sloped shoulders and a narrow neck. Bottles constructed of blue glass provide adequate UV protection, assisting with keeping your light sensitive products maintained when storing. The black phenolic caps with LDPE cone liner offer an added layer of security while closed. Test these 4 oz glass boston round bottles for packaging a wide variety of products.