Mercury Y-13 is part of the 2020-2024 upgrade series, but unlike the other blades in the series, it has no prototype and no carbon layers. Instead, it is said to contain two fiberglass layers. Thickness is as expected 5.7-5.8 mm, weighs 90 g. Ballance is slightly head-heavy because of the relatively larger head - 159x151. Construction of the blade seems to be limba-GF-ayous-ayous-ayous-GF-limba. There are no vibrations but you have the necessary feedback, so the general feeling is excellent. Pairs well with H3 Neo. Makes them look harder, esp. the Hurricanes. This is a fast offensive blade in the middle Off range with catapult effect and large sweet spot desighned for 2-wings topspin attackers.