Predictable: Retains spherical shape with consistent cross sectional diameter after reconstitution with aqueous-based solutions, such as contrast media and 0.9% saline solution, for predictable flow-directed level of occlusion in the vasculature.

Conformable: Affords atraumatic conformability to the architecture of the vessel lumen, providing more contact surface area with the embolic material and the vessel intima, leading to a more complete occlusion of the vessel.