Samson Ultra Tech 3/8"

If it were me, I'd not use UT, I'd go with Beeline, HRC, Ice Tail, anything that didn't have a majority of poly making up the cover. UT and Tennex have the same cover, Tennex is more wear resistant, but they both suck compared to non poly variants mentioned above.

I would use a locking brumnel on both ends with a tapered bury.