Hi Gwen,
You will need a total of (6) 3 inch ChiaoGoo Stainless steel tips plus the one pack of cables to make 3 flexible dpns's like the addi FlexiFlips. The cables are 3 to a pack.
ChiaoGoo 3 inch tip sizes US-000 (1.5mm) thru US-3 (3.25mm) have a MINI (M) join and use the 2 inch ChiaoGoo Mini (M) Red Twist cables.
ChiaoGoo 3 inch tip sizes US-4 (3.5mm) thru US-8 (5mm) have a Small (S) join and use the 2 inch ChiaoGoo Blue X-Flex (S) cables.
The parts are located in this category:
https://www.handsomefibers.com/chiaogoo-twist-shorties-stainless-steel-interchangeable-knitting-needles
I hope this helps and thank you for asking. Tracy, Handsome Fibers.