New Composi-Tight 3D Fusion Firm matrix bands with eZ-Place technology maintain their shape during placement making them significantly easier to insert. eZ-Place technology combines specially processed stainless steel with a proprietary matrix band forming process to yield Fusion Firm's remarkable handling characteristics. It resists deformation nearly 70% better than typical dead-soft bands, yet is pre-contoured and super thin at 0.0015". You're ensured the tight contacts and ideal anatomy you've come to expect from the Composi-Tight 3D Fusion system. Height 6.1mm, (w/ext. 7.7mm), molars with deep cervical preparations.