RPI Sheer Lock Ultra-Clear Locking Mi

RPI Sheer Lock Ultra-Clear Locking Micro Tubes, 1.5ml, Assorted Colors, 500 per Package; Sheer-Lock micro-tubes offer the security of screw cap tubes at a fraction of the price. Sheer-Locktubes feature a patent pending lock that snaps easily into place with a one hand operation. Lid has a large, rounded design that closes easily and securely without excessive thumb pressure. Additional features include pierceable lid, graduated markings, and frosted writing surfaces. Sheer-Lock micro-tubes are constructed of ultra sheer polypropylene and are autoclavable. - RPI