16mm average diameter size. 1 1/4" average length of entire pendant with silver spiral. This stunning spinning spiral disc is attached to a strong sterling silver spiral for a fantastic finished pendant. Look at the enlargement to see all three sizes available. These hand made glass pendants are made by one of our talented local lamp-work bead artist, Nikki Thornburg of Thornburg Bead Studio from Newton, NC. Each piece is unique in shape and color as all are wonderfully hand made. Mix and match colors and sizes to make a unique necklace with a series of these "Spinning Sprials". Or simply use one for a simple look. Oh... .the possibilities.