You fill the handle of these brushes so no cup to spill or tip over. Just need to unscrew the tips and fill. They work great with any watercolors paints . There are 6 brushes each with a different tip. Rangeing from fine thin line to Big thick brush heads. Easy to clean just squeese and wipe till clean. #rankboosterreview #Sponsored #Eschone https://www.amazon.com/Eschone-Coloring-Watercolor-Painting-Powdered/dp/B077PNCX9H