10ml clear serum vials with caps and stoppers different color for flip off seals 20mm black, green, pink, ... , 20mm flip off capscolor: different color for flip off seals 20mm. black, green, pink, gray, blue, orange, ... lables on 10ml vials.3. custom logo on seals. 4. custom logo on stoppers. material: 10ml ... stopper made by butyl rubber, 20mm flip off caps made by plastic security tops + new aluminum cap ...