This patented design is exclusively from Sargent Art. Easy-open, hinged tab lid never detaches. Includes locking clasp. Twist-off grooved rim cap for easy spill-free refilling. Inner rim seal recycles moisture & prevents evaporation. Dual brush holders and clearly marked fill line. Each pack includes 4 no-spill cups. Sold as 3 packs for a total of 12 cups.