The invention relates to a closure, in particular syringe closure for sealingly closing a distal opening, for example a syringe cone of a syringe body, the closure, in particular the syringe closure comprises a disposed on the syringe body around the distal opening, in particular the syringe cone around or which can be arranged fastening element, in particular a Luer includes lock or a luer lock adapter and a distal opening, such as the syringe cone sealingly closing and detachably connected to the fastener cap. The invention is characterized in that the closure cap in the region of the fastening element material fit, preferably exclusively material locking manner with the fastening element, in particular the Luer lock or Luer lock adapter by at least one connection point and a connection surface is connected and the closure cap has a hard region and an elastomeric member, wherein the elastomeric member securely closes the distal opening in particular, only by resting or enclose a short section in the region of a tip of the distal opening.