Lightly used, Team Associated Main Drive Shaft TC3.  Team Associated part #3924.  Similar to Team Associated part # 3937 (blue aluminum Drive shaft), but much lighter.

This was the first issue of the drive shaft (there were 2 others) and arguably the best.  Associated replaced the composite parts in earlier kits with cheaper aluminum models.  

this one has been used and has slightly wear on the tips (hidden when installed).  the shatf itself it like new, free of nicks or rub marks.