If you use liquid masking fluid on your paintings this little item is a must!!!! A rubber cement pick up makes removing masking fluid a breeze. It doesn't smudge up your painting and it last for years!!! Mine is almost 25 years old! Some people use their fingers to rub off the masking fluid but that can smudge your paints or make a soiled looking spot on your paper. Just use the corner or edge and it will cleanly pick up your masking. Size: 2" x 2-1/8" x 3/8"