MMT321 Micro quick release 24″ soft set infusion set. 12 in a box. Everybody is different and those who prefer a shorter soft cannula now have another option. The Sof-set Micro QR® has a cannula only 6mm long! (Sof-set Ultimate is 9mm long.) This set is designed for leaner bodies with your maximum comfort in mind. The Sof-set Micro also works with the same Sof-serter™ you have come to know and trust.