Are they better quality than say Gemfan, which flex and require much balancing? Is that $20/pair?
The problem I have with most T-Motor clone props is they are limited to about 400-500g of thrust because of being weak. Above that they cause problems. Plus the trailing edge is somewhat thicker.
I know these aren't TM, but just asking as my quad that would be using these weights 2.7-3.0kg depending if gimbal is attached.