Lightweight aluminum poles from Ecotone:  a set contains 4 tops and 2 bottoms, of 18mm diameter (0.7inch) aluminum, assembled height 2.84M (9.3 feet).  Additional tops and bottoms, and "half-sets"  are available.  Handy guy line kits are free with your order while supplies last.

 

Aluminum Net Poles from Ecotone

Net Poles from Ecotone