Rowland SS American Gag Bit with Single jointed Hollow Mouth features a jointed mouthpiece with cheekpieces that slide through a fixed ring, offering direct pressure and lift.
Rowland SS Cheltenham Gag Bit with Twisted SS Mouth Piece features a mouthpiece with loops on the sides for the gag cheeks (usually leather or rope) to slide through.
Rowland Loose Ring Snaffle solid SS Mouth Double Jointed with Lifesaver having Players is a popular type of horse bit used primarily in English riding disciplines. This snaffle bit consists of a mouthpiece with rings on either side.