Leone Classs II CorrectorThe New Non-Complaince Device for Treating Class II Cases View Case Reports : Case Report I Case Report II The Reduction in size and the inner spring provide an optimal patient comfort. There are 3 sizes available with possibility of either mesial or distal attachment to the upper molar tube, for total of 6 positions in the mouth. When utilized in mesial position, it can be anchored to a direct bonding single tube, without the need for a band or a round tube. The mandibular advancement is physiologic and it is determined by a continuous light force. it spring of 200g.