It really depends upon what kind of bird you have and what your specific bird likes to chew on. Each and every bird is different, just like us people.  So try a whole bunch of different toys and bird toy materials when you first get your new pet bird. Try bird toys such as balsa wood, crinkle papers, hard wood toys, rope, soft kabab wood, and more. Eventually you will figure out what kind of bird toys are most enjoyable for your feathered friend to play with. Then your questions has been answered.