In reply to Northernladlovesgravy:
5.5mm dyneema will do old fashioned camp Hex 2 (with a slight fight threading), Hex 3 and Hex 4 but will be a bit loose on a Hex 5.
One thing to consider is the length of the cord. If you make them longer than Needlesports suggest you can use them without needing an extender. Which is excellent for scrambling/some alpine routes e.g. Cuillin ridge Hexes 1-5/6 with a krab each and some slings; light weight and job done.
Downside to a longer length is that in winter they may hang a bit low, and risk entanglement in crampons when high stepping, hence people racking higher on a bandoleer/sling or doubling up to shorten. In summer the smaller sizes can entangle with larger cam lobes, so thought to racking required.