Flexi-Flow Auto Post Cement - Gray / Natural A3 - 2 x 4.5gm Syringes2 Auto Mix Syringes (each containing 4. 5gm base, 4. 5gm catalyst), 20 Mixing Tips, 20 Intra Oral Tips (Self Cure). Flexi Flows high density large particles and low density small particles work together to form a highly compressive and efficient composite. Flexi Flows matrix, reinforced by the cohesive strength of titanium, lanthanide, and silica keeps the post to dentin interface from breaking down.