Pickle Pebbles - Glass Fermentation Weights for Small-Batch Mason Jar Fermentation Handmade Glass Fermentation Weights for Mason Canning Jars $5 each pebble, any size $20 for 4 pebbles, which would come in a box if desired and available. You may buy only one pebble or more as you need. Food-Safe, Lead-Free and Non-Porous Glass Ferment Weights - Made From Pure Soda-Lime Glass (same material used to make Ball, Kerr and Bernardin Mason Jars) Specifically Designed to keep vegetables submerged below the brine and prevent mold in small batch lacto fermentation 2 sizes available: For Wide Mouth Mason Jar: Pickle Pebbles Plus (Dimensions: 2.75 " diameter with 0.75 " thickness) For Regular Mouth Mason Jar: Pickle Pebbles Standard (Dimensions: 2.25 " diameter with 0.6 " thickness) $5 each pebble, any size $20 for 4 pebbles, which would come in a box if desired and available.