Nipro Standard Hypodermic Needles 21g x 1-1/2" (AH+2138). The Nipro Hypodermic Needle has an ultra-thin wall compared to other conventional needles, permitting rapid and efficient drug delivery with minimal trauma. Hub is color-coded GREEN for accurate, quick identification in or out of the package. Hub translucency provides confirmation of flashback. Paper-to-plastic packaging is convenient and environmentally friendly. Excellent value. 100/BX 10BX/CS. Priced per box.