With sizes available from Mini to Warmblood, the Korsteel Stainless Steel Full Cheek Snaffle Bit is a fantastic training tool to encourage correct head position, turning, and reining. 
Details
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Full Cheek Snaffle: Narrow arms project above and below the rings, therefore preventing the mouthpiece from sliding in your horse's mouth and emphasizing the turning aid. 
\nSingle Joint Mouthpiece: Bit is designed to encourage your horse to raise its head through a "nutcracker"-like action on the tongue.
\nStainless Steel: Lightweight, durable, and strong material retains a shiny appearance that does not rust, and will maintain a neutral taste and smell with age. 
\nSizing: mouthpiece is 13 mm thick; cheek pieces are 6 ¼" long.