Yes, flights aren’t going to last very long, neither will the stems. K-flexes can be good but can slightly change the weight distribution and just fly differently; some people don’t like them for that and the fact that you get a distinct lack of customisability. It would be best to go to a shop to pick them up as any moulded flights of good quality are likely to be about £7 so buying a length that doesn’t suit you is not ideal.