V181 1ml shell vials,1st hydrol glass,clear, 8mm PE-Plug,soft, without insertion 8.2*40mm 1ml Glass Shell Vial Clear Micro-Insert, with 8mm PE-Plug, 40mm x 8.2mm (Pack of 100) 1st Hydrol Class Clear Glass 8mm PE-Plug Soft without insertion barrier for Micro-Insert Shell vials feature thicker walls for safer sample handling.