Royal Langnickel Medium Essentials Tin Box Watercolor Pencil Set – (16Pc) RSET-ART2307.  This Medium Tin Art Sets offer a generous collection of premium quality art supplies in one medium sized tin. Easily take art supplies with you while traveling by slipping this compact tin into luggage for worry-free portability. The durable, sleek silver tin keeps supplies neat and organized while protecting them from any damage.