Seems like me like you could buy a spool of Amnesia low memory level mono line in 30lb weight,and get the same thing as you're showing here. 100 yards costs less than $10.00,and it casts fine.
Sir I'm just starting got a set up, confused a bit, does thing line sink, float? And do you normally cut like you said 9,10, a5ft leader and fish like this or tie to forked line?