These tight-sealing reusable jars are compatible with the Essential Ratchet Grinder, so you can attach one to the grinder and grind fresh spices directly into the jar, mess-free! Each jar holds 3 T/44.4ml of ground spices, with graduated measurement markings. Set comes with 4 jars and lids.The Spice Storage Jars are part of the Kuhn Rikon Essentials line of well-crafted basics for every kitchen.