EMA FORMULA: Advanced blended EMA (Ethyl Methacrylate) makes it safe for cosmetic use. MADE IN THE UNITED STATES: Liquid Monomer is developed and produced in the United States of America. Prepared under the strictest quality control, with ingredients and formulas friendly to the environment. LEAK-PROOF PHENOLIC CAPS This modern leak-proof cap eliminates the need of the classic paper/plastic seals that can detach from the bottle neck due to the monomer chemical composition. Phenolic Caps made of industrial-grade highly rigid plastic, molds itself around the sealing areas as the cap is screwed on, virtually eliminating leakage, evaporation, contamination, and forming an exceptionally tight seal. PREVENTS DISCOLORATION: Its advanced non-yellowing formula prevents discoloration. PROVIDES OUTSTANDING FLEXIBILITY.