The hardness of the sponge is given as 38 degrees, but in reality it is about 42 degrees. However, since the sponge of the "normal" 802-40 is also harder than indicated, the ball stop of the 802-40 Mystery is only slightly harder compared to this version.
However, the 802-40 Mystery is noticeably faster and more catapult-stronger than the 802-40, as well as a higher elasticity of the sponge. Overall, the 802-40 Mystery is therefore an interesting alternative for those who want the Friendship 105 Legend too soft, but who want more pace and spin than the other short bumps of Friendship.
Unfortunately, this covering is only available in 2.2 mm.