Aquarian QS2-B Super 2 Serie, Drum Head Set Standard - double-ply drum heads set. Contains 12" & 13" tom heads, 16" floor tom head, 14" coated snare head. Patented Safe-T-Loc hoop prevents the head from slipping and the sound curve collar design provides responsive tuning (one turn of the drum key and Super-2 heads react). A free tuning sheet is enclosed with each Super-2 drumhead.