AngelaKerry Tapered Rubber Stopper #0 Flask Test Tube Plug Solid Laboratory Bungs White Stopper&pound;&uml;#0 Pack of 50pcs&pound;&copy; Condition: 100% Brand new. Material: Natural elastic rubber. White stopper very easy to stick dust, It must be cleaned before use; Rubber stoppers are manufactured from natural elastic rubber. You can use for Flask stopper,Test Tube stopper or other bottles stopper etc. If you need #1-#6 of this items,you can search ASIN: B00T9CD8MW; If you need #7-#10 of this items,you can search ASIN: B00T9DOZLO; If you need #11-#14 of this items,you can search ASIN: B00T9EUJCW; If you need #15-#20 of this items,you can search ASIN: B00T9G2ER8