Envy Firmer Silicone Breast Enhancer with Raise Nipple Uplift Cleavage One pair Firm silicone breast enhancer (Do not equate silicone breast enhancer with silicone breast forms.) Simply slip them under your bra to uplift breasts and create cleavage Slightly concave back to give a better fit Material: Firm Silicone enhancer they are not gel silicone Weight: 9oz/ 257 grms,5.1' x 3.9' ,Thickness: 0.7' at the thickest point