PTFE/ silicone septum for 2ml, 4ml, 10ml HPLC vials. color is red, blue, white ,natural . septa ptfe/silicone septum 12mm dia 1.5mm thickness for HPLC 4ML vialsdiameter:12mmprompt deliverylowest price,high qualityOur products are the same as Agilent and shimaduBest price with comparable qualitySample is freeWe can deliver goods within 15 daysSmall order is OKOEM/ODM is acceptable 1.use for hplc, ...