Zirconium vessel with niobium rim
1 3/4 x 2 inches
44.5 X 51 mm

Ref# 21

Tantalum vessel with niobium rim
1 3/8 x 3 3/16 inches
35 X 81 mm

Ref# 22

Niobium vessel with niobium rim
2 x 2.5 inches
51 X 63.5 mm

Ref# 23