Looking at:
http://www.princett.com/EN/USD/category-7/page-Galaxy-Yinhe-Milky-Way.html
The E1 or E3 are 5-ply wood blades with no carbon, E1 has Koto surface (harder, less bounce), the E3 has Limba surface (softer, more bounce). For learning topspin the E3 is probably better, for control the E1...