Description

Sterile single-use pen needles, 31G x 4mm, for use with reusable injection pens. Triple-bevel tip and medical-grade silicone coating for smooth, low-force insertion; thin-wall design widens the inner diameter so thicker solutions flow easily. Complies with ISO 11608-2 and fits the V2 pen and all mainstream pen brands. 100 needles per box.

4mm is the shortest common length — the most comfortable option and the easiest to place in the subcutaneous layer without going too deep.