This Amoena 170 is for use with Amoena 383 classic contact breast form. The back pad allows this attachable breast form to be worn traditionally in a pocketed bra. Foil covers the adhesive back during storage to protect against dirt and lint. Specify right or left. Order size 1 for breast form sizes 0-2; Order size 3 for form sizes 3-4; Order size 5 for form sizes 5-6; Order size 7 for form sizes 7-8; Order size 10 for form sizes 9-10; Order size 12 for form sizes 11-12.