I bought the heavy grade of tubing . As with the hot weather condensation forms in the cheaper grades ..thus causing blockage problems , and having to constantly " blow out "
This is pre bent tubing , and helpfully sliced to a pointed end to make it easier to insert into the ear mold .
I am very happy with the performance . Although more expensive , they are well worth thd money .
Arrived quickly . No issues .
Will buy again .