Aluminum
Fits Alpha One Gen II drives.
Quicksilver Branded, Clamshell Package Point of Sale Packaged

CM821629KITM - Magnesium Anode - for fresh water only. Not recommended for salt or brackish water. 
Fits Mercruiser Alpha One Generation Two Sterndrives
This kit contains:
• CM821629 X 1
• Mounting Hardware
Dimensions...

CM821629M - Magnesium Anode - for fresh water only. Not recommended for salt or brackish water. 
Alpha I Generation II Engine
Dimensions:
Length: 190.50mm (7.500in)
Width: 73.15mm (2.880in)
Depth: 16.26mm (0.640in)
...