Trust Mullen Loose Ring Trust Mullen Loose Ring £65.00 This bit is currently out of stock please contact us for more details. A comfortable, kind bit due to its flexible mouthpiece. Ideal for horses that back off the contact. Flexible steel core in centre to ensure safety. For dressage use please take off bit rubbers! We have been finding that the rubber bit rubbers sometimes react and cause mild brown staining on the mouthpiece. We have contacted Trust regarding this cosmetic issue.