These are replacement eyelets. Gold color. There are 300 pieces, and you can easily make holes for stringing in leather, vinyl, etc. Inner diameter 4mm Thickness of attachment is up to approximately 2mm. Great for leathercraft, keychains made of vinyl material, handicrafts, etc. They will be shipped in a brown envelope. Also, I have a pet (cat). I will be very careful to prevent cat hair from getting in, but please refrain from purchasing if you have a cat allergy or are sensitive to such things. If you have any other questions, please feel free to ask in the comments. Thank you.