I always used Bass Centre Elites from Strings Direct, only available as rounds but excellent value for the money, have just discovered that Bass Direct carry La Bella double balls , ordered a set of flats yesterday, (set of four plus a loose B string), arrived this morning & strung up my trusty old Sei, the windings are not as neat at the ball ends as some other makes I have used, but fitted without any issues, they feel great & initial impressions are they sound good, have a rehearsal on thurs so will get a better idea then. Status hot wires can be a bit marmite & they don't carry the range they used, good luck in your quest, mike b.