1000pcs 10ml Headspace Vials+ 1000pcs 20mm Crimp Top. 100pcs 10ml Headspace Vials+ 100pcs 20mm Crimp Top. 500pcs 10ml Headspace Vials+ 500pcs 20mm Crimp Top. Clear glass vials with 20 mm crimp seal finish are designed to fit most headspace autosamplers.