The Aquarian Response 2 is a two-ply head manufactured with Aquarian's multi-ply vacuum tuned process that eliminates air bubbles and wrinkles from between the two 7mil plies. Aquarian's most versatile two ply head, the Response 2b series delivers a full sound with great attack and consistent tone from drum to drum. Aquarian's most versatile two ply head, the Response 2b series delivers a full sound with great attack and consistent tone from drum to drum. The RSP2 can be tensioned tight or loose and has a clean, open sound with an articulate attack. This series works great in all musical situations and is designed for drummers who play it all.