Usage Tips:[Fermentation Kit - Perfect for Homemade Fermentation] Includes 4 glass fermentation weights, 4 wide-mouth 304 stainless steel fermention lids , 4 water airlocks, plus 4 silicone gasket and 4 silicone stoppers (jars not included). Fits all wide-mouth fermentation jars, providing a complete solution for fermenting , and more-safe, hygienic, and easy to use![Food-Grade Glass Fermentation Weights] Fermentation jar lids made of high-density glass, each sauerkraut weight approximately 7 oz (200g) to keep fully submerged below . The non-porous resists absorbing odors, flavors even after long-term use.[304 Stainless Steel Fermenting Lids - Rustproof & Airtight] Crafted from seamless stainless steel , these wide mouth fermentation lids feature silicone seals for a perfect airtight fit. The wide-mouth design allows easy handling, while the airlock releases gases, ensuring stable and hassle-free fermentation.[Smart Airlock System Design] Dual-channel fermenting airlocks create CO2-release. Pre-drilled holes with reinforced grommets seals. Silicone stoppers (included) allow jar storage post-fermentation without lid replacement!The fermentation kit is a complete pickling kit designed for homemade fermentation.[Silicone Stopper Design - Effortless Sealing After Fermentation] No need to replace the fermentation jar lid! Simply remove the airlock and plug the hole with the included silicone stopper to switch to storage mode. Saves time, and locks in freshness. The sauerkraut kit is a complete fermentation kit designed for homemade fermentation.Color:TransparentMaterial:Glass+PlasticPackage Contents:1 * Fermentation Kit(Jars Not Included)Only the above package content, other products are not included.Note: Light reflection 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.