Material: Original color 304 stainless steel
Apply lubricant or similar baby skin care products before using for lubrication.
Size: see picture for detailed size.
Cage length is about 41mm and inner diameter is about 35mm.
Rings come in 3 sizes: 40MM/45MM/50MM
Product net weight is about: 140 grams
(Note: There will be some slight errors in product dimensions due to different measuring methods, measuring tools, factory production batches, etc. In general, an error of ±2 mm is normal and not is a quality problem or inconsistent size description Thank you)