The Lock Box is a fantastic palette that allows artists on the move to store and transport their paint. It keeps oils and acrylics moist for up to 30 days! Teachers love it for distributing paints to students in the classroom. The top of this 11-1/2" by 1" thick unit locks in position with a secure slide fastener. Inside, paints can be stored in a circular plastic palette or on mixing paper. Its a perfect container for acrylics, watercolors, oils, and gouache. With wet sponge strips in place, paint stays usable for weeks, helping to eliminate wasted paint.