Canada Two Dollar Coin, Elizabeth II. Royal Diademed Portrait, Polar Bear and Cubs Design Issued to commemorate the 2000 Millenium, the Path of Knowledge. Composition: Bimetallic Ring : .99+ nickel Core: .92 copper, .06 aluminum, .02 nickel Weight : 7.3 grams Diameter : Ring: 28.0 mm; Core: 16.8 mm