No need to crimp or assemble screw caps. With the polyethylene plug cap; just push in to seal. 4 mL clear shell vial, 15x45 mm, with polyethylene plug cap. Vial is type 1 borosilicate glass.Packaged: 6-1/2 in. x 5 in. x 3 in. Plastic box; Weight: 567 g.