10 x polystyrene test tubes together with 10 polyethelyne stoppers ,these polystyrene test tubes are sized 150mm (length) x 16mm (diameter) - 6 inch tubes!,these tubes hold 20ml of liquid - with stopper in top,they hold around 18ml,they are:,round-bottomedheavy duty,re-useable,machine / glass washer proof, ,these tubes have a number of interesting uses including:,arts & crafts,storing,medicines / spices/sauces / dried flowers,used as postal tubes for fragile,items/samples,used for confetti,cigars,and more recently wedding ,favours,we use them in our bars / nightclubs to sell shooters / shots in for our customers favourite drinks,we have noticed that it is not only quicker to dispense sambucca,tequila,apple sourz over the bar quicker,the customers absolutely love the novelty factor of them!,the stopper ensures,that the products are sealed and water-tight. Customers can put the ,test tube shooters in their pockets and carry their other drinks away ,from the bar as they will not leak,