There are three styles available of the Pectoralis Implants. Multiple sizes come with each style, but style 1 is the most popular. These implants are available in sterile and non-sterile types. They are sold and packaged individually instead of in pairs.These implants are mirror-image and are directional and made for a specific side. Normally, they are inserted through the armpit in a transaxillary incision above the pectoralis minor and below the pectoralis major muscle.