This Stagg X Pour-Over Dripper is made specifically for our 12-ounce Travel Tumbler. Whether you're a coffee expert or novice, this pour over dripper will help you consistently brew the perfect cup. Feature Details: Vacuum insulated for ultimate heat retention during your brew. Steep slope to increase coffee to water contact and boost extraction. No clog drainage hole and bumps. Ratio aid measures out 1-2 servings so you always know the right amount of coffee to add. Ratio aid also acts as a drip cup for when you're done brewing. STAGG [X] - Brews 1 cup brew (300ml/10oz) Stagg [X]’s shorter height aligns with the traditional pour-over brewing methods of a continuous slow pour. Brewing with Stagg [X] gives you more control over your water dispersal and extraction.