Making stuffed animals, amigurumi, or dolls? These safety eyes are a must-have! You get 50 pairs (100 total pieces – each 'set' is one eye plus its backing washer). They are 16mm in diameter (about 0.63 inches) and come in a deep, realistic black color with a shiny, 3D-looking finish that makes them look lifelike. They're made of durable plastic. The back has a threaded post – you push it through your fabric or crochet work from the front, then snap the washer onto the back from the inside. This locks them securely in place so they're safe (hence the name) and won't pull out, which is especially important for toys. They're perfect for all sorts of craft projects, from cute animals to Halloween decorations. Just make sure the 16mm size is right for your project's scale before you start!