Happy Mouth Loose Ring Roller Centre Snaffle. The Happy Mouth Bits are made from hi-tech plastic moulded around a stainless steel centre for added durability and feature an apple scent to help acceptance of the bit, mouthing and help to improve performance. The Happy Mouth Bits bits are warmer to the touch than traditional stainless steel bits, making it ideal for younger horses or horses with a sensitive mouth. Happy Mouth Loose Ring Roller Centre Snaffle is a double jointed bit that acts on the tongue and bars of the mouth. Read more… The Roller Centre Snaffle offers a oval roller lozenge instead of a usual jointed bit, this lozenge is ideal for horses who do not accept the nut cracker action of a traditional jointed bit and offers them something to play with, helping to encourage mouthing and salivation resulting in a horse with a soft and relaxed mouth.