I have a standard Dunhuang guzheng, 双鹤 model, and these dusters work perfectly. I have animals in the house and even with a dust cover it gets dusty so this helps a lot. 
 
Pros: Fits into all the nooks and crannies. 
Cons: None 
 
Thoughts: These are not the highest end, price is fair, but they make life so much easier. Use a vacuum over where you are dusting to get best results. But don’t touch it to the guzheng! I also have a 4 cm soft paintbrush I use for stubborn edges, especially along the decorative panels. 
 
Highly recommend for any guzheng owner!