Connecting Threads Pro is 70wt and it is made for LA use so it's strong. I use it in my bobbin with all weights and brands of piecing thread and it works great. My bobbin seems to last double the time too. I have over 48 mini spools of Aurifil so I know it's great thread but no better then other quality 2 ply brands and I have some of all of them to compare to each other. If the thread says lingerie or basting thread it is not strong but that is old labeling and not many threads are made weak anymore. The new poly thread made today does not have the problems that the old cheap poly use to have.
Last edited by BellaBoo; 09-08-2012 at 08:48 AM.