【Real Materials】 Dental matrices are all made of stainless steel and are safe to use. 【Usage】Can be used upon restoration of proximal surfaces of anteriors 【Sizes】 5mm/7mm/9mm for choosing 【Packing】12 pieces matrices/pack for single sizes 【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!