Easily attaches and detaches to any portable easel or tripod with round or square legs between 7/8" and 1" in diameter. Made of Lightweight polycarbonate for easy cleanup. Metal support arms fold against bottom of the shelf for easy stowing in the SunEden StudioPac, or Artist’s Tote Bag, or Art-Duffle Backpack. Weighs less than 1½ lbs. and adds stability to the portable easel or tripod. Shelf measures 12” x 16”. Indispensable for all artists who need to carry their equipment away from the studio or for those with limited studio space. Shelf remains level even when the easel is tilted back.