Skin Tightening Collagen Jelly Essence Made with the unique combination of triple collagen jelly essence to maintain the nutrient level and hydrate the skin. Vegan Certified Material The collagen tightening mask has been made with VEGAN certified material to ensure maximum benefit to the skin. 30G Slim Fit Sheet Mask The sheet masks themselves are designed to be slim and light so as to ensure maximum comfort and increase the efficacy of the product.