Blendtec WildSide+ Jar (90 oz), Five Sided, Professional-Grade Blender Jar, Vented Latching Lid, BPA-free, Clear Blendtec products are built to the highest professional standards. No tamper/plunger needed. Professional-grade jar is compatible with all Blendtec blender models (not compatible with Blendtec Mix n' Blend models). Our patented, five-sided jar with extra-wide base and narrow fifth "wild" side automatically pulls ingredients toward the blade, instead of just spinning around in a circular jar. It increases blending efficiency for frozen ingredients by up to 25% and provides an over all faster, smoother blend. The WildSide+ jar also features two vertical ridges on the interior walls to disrupt the blending pattern even further. Includes blunt safety blade which is 80% thicker and ten times stronger than other blades. Easy-open gripper lid allows ingredients to be added through center opening and vents pressure when blending hot liquids. The WildSide+ Jar is a 90 oz volume jar with 36 oz blending capacity and easy-to-read jar markings. Blendtec jars are BPA-free and impact resistant (wet or dry). 3 year comprehensive warranty. An American company, family-owned and driven to build the best quality products - without compromise. Engineered and assembled in the USA.