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.
xs cage length is about 40 mm, inner diameter is about 32 mm.
s cage length is about 55 mm, inner diameter is about 32 mm.
m cage length is about 70 mm, inner diameter is about 37 mm.
l cage length is about 90 mm, inner diameter is about 37 mm.
xl cage length is about 110 mm, inner diameter is about 37 mm.
These sizes may have a little error because it's made by hand.
Weight is about 140-200 grams.