These Pectoral Implants are available in three styles with multiple sizes per style. The most popular style is Style 1. The impants are offered in sterile and non-sterile versions and are both packaged and sold individually rather than in pairs. All styles are designed as mirror image, so they are directional and made specifically for one side. The implants are inserted through an armpit (transaxillary) incision that's above the pectoral minor muscle and under the pectoralis major muscle.