Individual Packaging - Each package contains 100 units, individually packaged. Size: 18 x 1.5 High-quality Materials - Made from high-quality stainless steel and polypropylene materials. Luer Lock Design - Designed for use with both straight and threaded openings, Easy to use. Multiple Uses - Used for industry, scientific research, laboratory, plant. It can also be used to replenish gel, paint, ink, perfume, lubricant, etc.