Filtek Bulk Fill Capsules Refill - A1, 20 - 0.2g Capsules. Posterior Restorative. One-step placement, no additional capping layer. Stress relief to enable up to 5 mm depth of cure. Excellent handling and sculptability. Designed for posterior restorations, the unique optical properties and improved opacity of 3M Filtek One Bulk Fill Restorative offer the simplicity of one-step, bulk fill composite placement — up to 5mm — without compromising esthetics. This posterior resin composite increases restoration efficiency and reduces stress. 3M's TRUE nanotechnology provides exceptional polish retention for impressive results that are made to last.