10ml clear serum vials with caps and stoppers different color for flip off seals 20mm ... , green, pink, gray, blue, orange, yellow, redcoral, lavender, purple, violet, white, light blue, royal blue, dark blue, mist grey, dark greydifferent ... . 4. custom logo on stoppers. material: 10ml vials made by clear sterile serum vial, 20mm rubber stopper made by butyl rubber ...