Features： 1、Can be attached to any bicycle to make colorful pictures when riding down the street, cruising in the lane or winding on the sidewalk. 2、Fix it on the bike fixed frame to use, install the chalk, and then adjust the size, you can draw while riding. 3、Comes with 4pcs of chalk of the package, which are durable and can bring endless fun. 4、A very unique and novel idea. Wonderful and nice gifts for children and kids. 5、Suitable for all sizes of bicycles and auxiliary wheels, suitable for both children girl or boy. Specification： Item Type: Bicycle Doodle Pen Material: PVC Bicycle Fixed Frame: Black Chalk: Random color Applicable: Both male and female Age: No limit Fixed Frame Height: Approx. 25.3cm / 10in Fixed Frame Width: Approx. 3cm / 1.2in Fixed Frame Tube Outer Diameter: Approx. 6.3cm / 2.48in Fixed Frame Tube Inner Diameter: Approx. 4cm / 1.57in Chalk Size: Approx. 11.2 x 3.5cm / 4.4 x 1.4in Package List： 1 x Bicycle Fixed Frame 4 x Chalk