Premier X5 Sectional Matrices 6.5 mm Blue View Tint Refill 80/Package Affordable, reusable proprietary resin rings Ð up to 5 autoclave cycles. Anatomically shaped matrices allows for proper contouring. Designed to deliver perfect tight contacts every time. Cost effective when switching from expensive NiTi ring systems. Introducing the Premier X5 Sectional Matrix Systemª Ð a complete, high quality, 5-component sectional matrix system designed to achieve accurate Class 2 composite restorations with smooth contours every time.