Specifications: These crayons can be drawn on a variety of materials such as plastic bottles and milk packs. The extra thick shaft makes it hard to break. For childhood use only. Arts & Crafts Dowel Crayons Material: Box: Paper, Middle Partition: PS, Roll Label: PET; Color Shaft: Pigment, Wax, Physical Pigment, Oil; Body Size: 7.7 x 3.9 x 0.7 inches (196 x 99 x 18 mm); Weight: 6.3 oz (165 g); Color: 16 colors; Extra thick shaft; Clear label roll; Rubber box; Single color: PTCGP-T; Painters Dot Com; Postcard A; 1 x Cute Animal Postcard