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Specifications:33G x 4mm dispensing needle accessory; compatible with most pens. Individually Packaged: Each nib is sealed separately, featuring an easy-to-use tear-off tab. Material: The needle tips are made of stainless steel, which is resistant to bending, and each needle tip is equipped with a protective cap. Thin-Wall Technology: Increases the inner diameter while maintaining the outer gauge (G), enabling higher flow rates and shorter transfer times. Wide Range of Applications: Suitable for various laboratory and technical applications requiring precise liquid sampling.