Specification:
Color: black and silver.
Material: nickel-chromium wire, plastic
Nichrome ring sizes: 1mm, 2mm, 3mm, 4mm (optional)
Package Included:
1xInoculation stick
50 x nichrome rings 
Note:
.The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness.
2.Please allow slight manual measurement deviation for the data.