I've recently bought a Yonex Duora 10 One time, when I was playing double I accidentally hit my friend's racket, and few of the carbon is chipped off (not paint), then not long after the racket cracked, I believe that it might be the carbon might have already had a crack Inside the paint some where I can't see, and perhaps there is less carbon distribute to that area, and somehow I am being lucky to hit that part. So I decided to tear the frame and share with all of you what inside an such expansive racket........ View attachment 180054 First there are a few layers - the paint - the few layers of carbon - A foam like object During this observation - I didn't seen to be identifying any of the special material like the one yonex has advertised. View attachment 180055 The carbon is crossed View attachment 180057 Bunch of carbon being tear off...... View attachment 180058 These two picture shows the foam like object, its yellow and quite soft. I believe it is Solid Feel Core --- The built-in solid feel core cuts harmful miscellaneous vibration at impact. Solid feel core is carried in all racquets manufactured in Japan. View attachment 180059 View attachment 180063 View attachment 180065 View attachment 180067 View attachment 180068 Thats it for my review, I was very sad that I could use this racket anymore, But I bought him a friend The new Duora 10 LCW My suggestion on this racket is Don't use it during double (unless ur rich) Slight impact is ok, but when its heavy clash the string lbs will cause the racket crack or even tear off the carbon. Otherwise this is a excellent racket, I recommended to all of you, you can go and have a try very good control medium power very fast back hand drive.. Thats it thanks for reading my reviewa Bye Bye my dear duora 10......