This is a set of 30 empty spools from home sewing machine thread. They can be used for dividing various threads, or creatively used for crafts, etc. (There are a few extra spools besides the 30, as they make a slight noise when packed.) Large Spools: Diameter: 38mm Height: 50mm Small Spools: Diameter: 30mm Height: 38mm These have been stored at home after use, so I have wiped them down as much as possible, but there may still be some dirt. Please understand this before purchasing.