【Real Materials】 Dental matrices are all made of polyester and are safe to use. 【More Dental Consumables】There are many types of dental matrix bands, this is just one. If you have any questions, please contact us and we will answer them at any time! Matrix ends are covered with a special glue layer for side-to-side conjunction. ---- No matrix retainer required ---- Alcohol immersion disinfection,disposable use,can not be disinfected under high temperature and high pressure; ---- Installation of self-adhesive matrix: 1.Install matrix 2.Remove red protective layer from matrix side 3.Stick glued matrix sides with each other Polyester Matrices For Premolar and Molar Packing : 10 pcs/box(For Premolar / Molar)