This rhinestone pet collar is made of copper and features a unique, super shiny design. The adjustable range is 20-25CM and it weighs 11g. The collar is very light weight, making it comfortable for pets to wear. The rhinestones are all fixed, so they will not fall off easily. The product contains one collar. Please note that the size may have an error of 1-3cm due to manual measurement, and there may be a slight chromatic aberration due to differences in monitor and camera lighting.