It's nothing to do with the factory.... that's to do with toxic materials. Bad factories use bad dyes which actually kill the bird. Crop infections caused by fabric toys is different.
viewtopic.php?f=22&t=10294&p=70667&hilit=rope+fibre#p70667This happened to a bird on this forum... crop infection from accidentally eating the fibres. The rope cannot be digested in the crop/throat so it sits there in the warm and moist which creates bacteria and the bird gets an infection. Bird's don't digest like we do.
Ok so it hasn't happened so far to your birds but why risk it? I wouldn't. So please read and listen to my advice... I wouldn't tell you if it wasn't right. There's nothing wrong with using the rope perch if you trim the frayed ends or replace it when it becomes worn.
Trixie is ok... not the best though to be honest. Java is the only really good brand around but I get all my perches custom made.
Sunflower should only be used as treats, seriously its soooo bad for birds. Its like giving them chips every day. You can still offer but only 2-4 seeds per day.
The rest should be fresh fruits, dried is ok for during the day when you're not there but lots of nutrients are lost in the drying processes, also vegetables. Fruits are quite sugary you need to be feeding leafy green vegetables more than fruits. Apple is good and banana is good but there needs to be more variety...
my birds eat about 35 different things... I'm quite experienced but you need to start expanding the diet young because its more difficult when they are older and then they refuse to eat it and it just becomes very difficult.
I'm sure you can get TIdymix shipped to you.