This 3D serpentine mixer is designed to provide more efficient passive mixing by splitting and recombining the flow in multiple high aspect ratio turns. More information about the mixer can be obtianed from the Analytical Chemistry paper (DOI:10.1021/ac4041857)
 
The mixer can be customised for the channel I.D, number of mixing units, total length of the mixer, and thread types. The current price is shown for the below-mentioned specifications:
 
Channel I.D: 0.7 mm
Number of mixing units: 6
Total length of the mixer: 10 mm
Thread types: 1/4 UNF female