28mm White Plastic Screw Caps With F217 Foam Liner - Pack of 15.  This cap features ribbed sides allowing for easy application/removal and a matte top. The F217 (foam) liner inside is a general liner that is compatible with most products. Fits all jars and bottles with a 28mm (28-400) thread. We warrant our products in the event that they arrive damaged or defective - Covered under our 30 day hassle free replacement program! .