Alterna Jar Lid - replacement lid, fits also on Blendtec jars, on the Wildside Jar and the fourside jar, plus all the other aftermarket BLENDER jars including on the VOID Vaccum Blend system jars. Has sound reducing properties on all Jars and blenders. Shipping included in the USA. We have learned from some commercial restaurant chains that our lids are apparently lowering the noise on Blendtec blenders.