Copper ring 5 mm internal, 10 mm external, 1 mm thick.

Copper ring 6 mm internal, 10 mm external, 1 mm thick.

Copper ring 8mm internal, 12 mm external, 1 mm thick.

Copper ring 10 mm internal, 14 mm external, 1.5 mm thick.

Copper ring 12mm internal.Copper ring 12 mm internal, 18 mm external, 1.5 mm thick.

Copper ring 14 mm internal, 20 mm external, 1.5 mm thick.

Copper ring 16 mm internal, 22 mm external, 2 mm thick.

Copper ring 18mm internal, 24mm external, thickness 1.5mm.

Copper ring 20 mm internal, 26 mm external, 1.5 mm thick.

Copper ring 22 mm internal, 26 mm external, 2 mm thick.

Copper ring 24 mm internal, 30 mm external, 2 mm thick.

Copper ring 26 mm internal, 32 mm external, 1.5 mm thick.

Copper ring 28 mm internal, 34 mm external, 1.5 mm thick.

Copper ring 30 mm internal, 36 mm external, 2 mm thick.

Copper ring 32 mm internal, 38 mm external, 2 mm thick.