Hi Vease, Greg, isnt it?
I don't know what the horns were exactly cos i never bought them. If i recall correctly i think they were extra long 3d horns. Don't trust my advice though because i am not sure exactly what they were. Just look at your current servo horns- if they are the ones that came with the servos(which they pretty much always do) then they are safe. If you are not sure then just test one of them to breaking point to find out once and for all if its strong enough.
Luke