Blunt-end needles with Luer Lock tip, used to connect a soft-walled tubing, such as silicone, Tygon, etc. to your microfluidic setup.  Luer Lock tip to ensure a safe and leak-free connection between a syringe and the needle.
 
In order to get better sealing and tighter connections, a needle with a slightly larger outer diameter (OD) than the tubing inner diameter (ID) should be used.
 
NOTE: It's NOT recommended to connect with rigid tubing (such as PTFE).
 
Specifications
 Material
Polypropylene (Luer Lock tip)
Stainless steel (needle)
Needle length
0.5 in. / 1.27 cm
Color
25G: Pink
23G: Orange
20G: Cream
18G: Green
16G: Grey
Sizes
25G: 0.26 mm ID / 0.51 mm OD
23G: 0.33 mm ID / 0.63 mm OD
20G: 0.62 mm ID / 0.90 mm OD
18G: 0.84 mm ID / 1.27 mm OD
16G: 1.32 mm ID / 1.60 mm OD