The poly hub needles have clear hubs (as opposed to colored) for easy viewing of flashback. The metal insert increases needle strength for animal health applications. The Tri-beveled, anti-coring tips are computer-ground for consistent sharpness. The needle has an anti-friction coating for minimal penetration resistance and animal discomfort. They come in tamper-evident cartridges are safe, convenient, easily disposed of and transportable and are color-coded to follow ISO standards. The lot number is printed on each cartridge for easy tracking. 25 Pack 20 Gauge x 3/4". Poly hub. Clear polypropylene hubs for easy viewing of flashback. Paper-to-plastic packaging is tamper evident and ensures sterility.