Our 2.0 ml, screw cap with o-ring seal, microcentrifuge vials are made of inert polypropylene and have straight walls with a sharp conical bottom. This vial shape is required for the Mini-Beadbeater-1+ and recommended for the MiniBeadbeater-16, MiniBeadbeater-24 and MiniBeadbeater-96.  Compatible with other brands of bead-mill cell disrupters and available sterile or non-sterile.For extraction and cell disruption of larger sample volumes we also have 7 ml polypropylene vials.  The vials include screw caps and, when combined with the appropriate adapter, arer used with the Mini-Beadbeater-16, -24, or -96.Note:  Using our high-energy Minibeadbeater series cell disrupters, current polypropylene microvials  (offered by us or other Providers) cannot be used with vials containing steel beads that also have a significant air space (i.e., dry milling).  During shaking, the steel beads will crack or punch through the vials.  No problem exists using zirconia or glass beads for dry milling or steel beads for wet milling where the air space wthin the sealed vial is minimized.  If dry milling with steel beads is required, as is commonly done at liquid nitrogen temperatures, use our stainless steel microvials equiped with silicone rubber stoppers or our exclusive polypropylene 'XXTuff™' 2 ml microvials.  The later are reinforced in critical areas of the vial and is fabricated using a special, high density polypropylene resin. Tests show that this vial is 10X more resistant to breakage - hence the name 'XXTuff'.