This new 1.35 kg (3 lb) counterweight is designed for SkyGuider Pro and SkyTracker pro counterweight package (#3324), as well as other iOptron mounts, which include:
Cube-A (Dual AltAz/EQ mounts)*
MiniTower/ II / Pro
AZ Mount Pro
* It works together with CW shaft (#8607) for Cube-A/G/E.