Please allow 1-2mm discrepancy due to different measurement method.
Diameter: about 18mm/0.7 in, 20mm/0.8 in, 23mm/0.9 in, 25mm/1.0 in, 28mm/1.1 in, 30mm/1.2 in, 34mm/1.3 in
Color: as shown in the pictures
Material: resin
Shape: round