Square-1 mod. To start it either needs a 90° turn of top or bottom or a 90° turn of the middle layer. The pieces follow not the 30°/60°/60°/30° angles of the standard Square-1, but have 30°/60°/90°. So several common algorithms will not work here.
Size: height 5.5cm, diameters 5.8cm / 5.6cm