The Ciari Anelli 1" Headset Spacer Kit includes one each 5mm, 10mm, and 15mm spacers which are designed to look the same no matter what combination you use to achieve the desired stack height.
S.H.I.S. Stem Clamp Diameter: 25.4
Thickness: 5 mm , 10 mm , 15 mm
This product is expected to become available for purchase on Monday, August 2, 2021