Fermentation Kit: Begin making tasty, healthy kimchi, ginger carrots, Hot Sauce, sauerkraut, pickles and other fermented foods with ease and safety. Canning Jar Lids: With a great sleek silver color they are perfect for that modern look that you want in your pantry. Makes an excellent gift for the fermentation expert in your life. Wide Mouth Mason Jar Lids: gaskets create a tight seal between the lid and the jar, preventing water, oxygen and dust from contaminating your ferments. Canning Lids Fits Any Wide Mouth Jar: Can be used for in, Kerr, Ball. Any brand of "Wide Mouth" Mason jar in pint, quart, or half-gallon. colour:Silver material:Plastic + Aluminum size: Approximately 86mm in diameter Package Contents: 4 x Mason jar fermentation lid Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.