All MagCAD headset parts are 3D printed in a durable Nylon to ensure they are robust to many years of use. As with any steering related components they should be installed by a competent mechanic and inspected regularly. Incorrect assembly or mis-use may result in damage to the headset components.
The complete headset kit has a total stack height of 30mm, not including the "top" Roval Rapide spacer. This remains within the maximum recommended headset stack height of 35mm by Specialized and covers most riders needs.
Additional 10mm and 5mm spacers can be purchased separately should they be required.