Crossbow Bolts are ideal for EK Archery Cobra R9 RX
These Bolts are similar to EK Archery's Cobra R9 RX bolts.
They measure the same, similar dimensions etc.
I would say the tips are heavier and the shafts are lighter.
No difference with the nocks & vanes.
But since they have domed tips instead of the sharper field tips they will ware a target down less and be more target shooting club-friendly.
To be honest I bought these 12 arrows because they were cheap and would keep me going while I found something better. But I have been using them for a few weeks and think that they are very good, they are keepers. The other good thing about them is that they can be customised. You can buy different points that just screw in and protective metal rings near the nock.