A Freund Exclusive! The wide neck opening means that these Kautex LDPE plastic bottles are easy to fill and clean. These LDPE bottles are ideal for high-viscosity media, powders, granulates, and pastes. The amber color protects light sensitive materials against UV-light transmission. Each wide neck bottle includes an Amber LDPE screw top cap that is guaranteed leakproof. To ensure leakproof performance, the included bottle and cap must be used together.