[Fermentation Kit - Complete Solution for Homemade Fermentation] Includes 4 glass fermentation weights, 4 wide-mouth 304 stainless steel fermentation lids, 4 water airlocks, 4 silicone gaskets, and 4 silicone stoppers (jars not included). Designed to fit all standard wide-mouth fermentation jars, this kit offers a safe, hygienic, and easy-to-use system for fermenting vegetables, fruits, and more. [Food-Grade Glass Fermentation Weights] Made from high-density glass, each weight is approximately 7 oz (200g), ensuring ingredients stay fully submerged during fermentation. The non-porous glass resists absorption of odors and flavors, maintaining cleanliness and performance over time. [304 Stainless Steel Fermentation Lids - Rustproof & Airtight] Constructed from seamless 304 stainless steel, these wide-mouth lids feature integrated silicone seals for a secure, airtight seal. The design allows for easy handling, while the airlock system safely releases carbon dioxide without letting in oxygen or contaminants. [Smart Airlock System] Dual-channel water airlocks enable efficient CO2 release while preventing oxygen entry. Pre-drilled holes with reinforced grommets ensure a tight seal. The included silicone stoppers allow you to seal the jar directly after fermentation without changing the lid, simplifying storage and preserving freshness. [Silicone Stopper Design - Seamless Transition to Storage] After fermentation, simply remove the airlock and insert the silicone stopper into the lid to switch to storage mode. This convenient feature saves time and helps maintain flavor, texture, and nutritional quality. Color: Transparent Material: Glass + Silicone Package Contents: 1 x Fermentation Kit (Jars Not Included) Note: Light reflection and differences in display screens may cause slight variations between the color shown and the actual product. Measurement tolerances are within +/- 1-3 cm.