What are some good chew toys for dogs?

i give my dog a lot of rubber toys but he chews them up really quick, even the ones that are supposed to be "indestructible". he chews up the cloth ones too, and even the rope pull toys. he even eats the fuzz of tennis and then rips them up. he already has a mostly-eaten kong. he wont chew on rawhides or bones but carries them around. any chew toy ideas? im at a loss. he LOVES to chew but i hate for him to destroy things in ten seconds and i have to keep getting him new ones.