So right now i'm testing out feather birdies, so i just ordered in some tai-lai 201 feather birdies for 18$/douzen and wondering why the corks are so hard? is it supposed to be like that? also anyone know if these are goose or duck feathers? the flight on these is quite good when freshly used, but during 1/2 - 1 full game the shuttle starts to die: the flight is off, does some weird circle stuff, and cant really control. I'm using them for practicing / friendly matchs. I used to use victor champ #1 or rsl but they weren't in stock.