10/1
The new ropes are rated at better than 10/1 or are you still climbing with manila? Myself, I try to stay away from the new aluminium hi-tech stuff, stick to steel or stainless with better than 10/1 rating. It is your life on the line. Have not worked with the plasma line yet, cost a bunch. Have some stuff costom made at a shop near here for loops and straps. Way past 10/1, never know when it will be handy to have. Oops, the new pulleys have hi-tech aluminium wheels, sheaves, in them. You can have OSHA on you for not using at least 10/1.
work safe/ live long