Ring has 2 types: "flat ring" is a O-shape ring, "curved ring" is a special-shaped ring.
Ring has 4 sizes (inner diameter) can be selected: 40 mm, 45 mm, 50 mm, 55 mm.
Cage length is about 90 mm, inner diameter is about 37 mm.
Please watch the detailed sizes in the pictures.
These sizes may have a little error because it's made by hand.
Weight is about 180 grams.