This blender is the Rolls Royce of blenders! It can easily handle the toughest blending jobs from smoothies to making peanut butter. The jar is a solid design, made from copolyester that helps to reduce noise, is chemical resistant and is sealed so no leaking. The blades are stainless steel and never need sharpening. It is available with two containers, one for wet and one for dry to be used to process coffee and grains. The Vita-Mix has two speeds: high and variable which gives you the ultimate control. It easily handled any job I could come up with! Since the motor is so strong, the blender is very loud - but if you are looking for a top notch blender, this is it!