I think it is metallic on the outside with carbon on the inside.
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Aluminium tube with a carbon fibre X brace which runs the length of the arm I believe.
Ok thank you, heard several with the cabon tube very good all of them.
From personal experience i would keep saving,sell anything not needed,starve yourself if required to save money.( Hell even sell a kidney!!!) and just buy an sme 309 . If the lower quality option is taken you will probably wish to upgrade in the future.....why bother? Life's too short for hi fi regret! Regards Ben