Material: Plastic/resin size: 10248550-9 MM 10248551-20 MM Please allow1- 2mm error due to manual measurement and make sure you do not mind before ordering. Color: brown quantity:10pcs weight: 10248550-64 grams 10248551-82 grams They come with plastic washers. They are perfect for making small stuff animals, crochet/amigurumi animals/monsters and crafts.