If you would describe your horse as something with the following;

• Can be on/off in the connection
• Slow reactions for your aids
• Feel stiff, "dead" in the mouth
• Sensitive for bar pressure

Bianca is a durable and lightweight double-jointed titanium bit. 

The shape of the mouthpiece combined with the short centerpiece eliminates palate interference. It breaks to the outside of the tongue.

The Titanium Roller gives the horse something to play with and is a very good option if the horse can feel stiff and get stuck in the connection.

Normal in size. If you are between sizes, go up.