Disc system syringe has dual aspiration feature to achieve self aspiration: - Aspiration before injection: Insert syringe in tissue and press thumb disc to achieve aspiration. - Aspiration during injection: Automatic aspiration occurs whenever pressure on the plugger is released. The syringe offers two simple ways to achieve easily the aspiration: - Aspiration is provided either by gentle releasing the pushing force on the piston -in this way the elastic membrane in the cartridge, previously deformed by the pushing, it comes back to its original shape ensuring an aspiration effect. - Or by pressing and releasing the thumb disc. Specifications: - Disc-system. - Euro Thread. - 1.8 ml.