Rumble Jar was awarded as a Kickstarter Project of the Year in 2018 for its design of a high-quality cold brew coffee filter that works in tandem with the classic Mason jar. This filter (plus a Mason jar) is all the equipment you need to make professional-grade cold brew coffee right at home. Just take your favorite coffee beans, grind them coarsely, add water to the jar and give it a rumble. Total prep time takes less than a minute, and by the morning you'll have delicious cold brew coffee ready to drink. This filter is compatible with wide-mouth one-quart/32oz Mason jars (not included). Includes:  + 18/8 Stainless Steel Cold Brew Filter, compatible with wide-mouth 32oz (One-Quart) Mason Jars + Food-Grade Silicone Cap, Available in 2 Colors (Orangey-Red and Dark Black) + Cotton Sock (optional 2nd stage filter)