"1\" (25mm) Metal Square Rings, Heavy Duty Quality Rectangle Rings, Sold in 4-in-a-Pack, They come in Four Colors, Antique Brass, Gunmetal, Silver and Light Gold. They are 4.3mm thick. They are not thin or too thick. I feel they are perfect for bag making. I really like them, since I am a bag maker myself. Thank you for visiting :D"