BOX OF REEDS FOR ALTO SAX. Traditional Series. Blue Box Number 2 1/2 Box of 10 units. Ref.SR2125 These reeds have been designed to produce an extremely pure sound, thanks to their very thin tip (the zone of maximum vibration), balanced by a very solid backbone (more wood in the zone that leads gradually towards the heel). ). Traditional reeds combine the thinnest tip with the thickest heart, thus allowing impeccable articulation with a full and dark sound.