Clear soda-lime glass reagent bottles dustproof with interchangeable 'Polystop' stoppers.For 30ml Bottle - Stopper Size: 14/23For 50ml Bottle - Stopper Size: 14/23For 100ml Bottle - Stopper Size: 14/23For 250ml Bottle - Stopper Size: 19/26For 500ml Bottle - Stopper Size: 24/29Pack of 10