Didgeridoos can also be made from PVC pipes , non-native hard woods ( which are split , hollowed and rejoined ) , fiberglass , metal , agave , clay , hemp ( a bioplastic named zelfo ) , and even carbon fiber . Non-traditional didgeridoos can also be made from PVC piping , non-native hard woods ( typically split , hollowed and rejoined ) , glass , fiberglass , metal , agave , clay , hemp ( a bioplastic named zelfo ) , and even carbon fiber .