These Yo-Yo Kits feature a ball bearing axle to make it sleep longer and perform better when doing tricks. The Yo-Yos are made with 5/8" x 2-1/2" square blanks and turned on the Standard 7mm pen mandrel using the bushings shown below. We also offer a short Yo-Yo Mandrel that is held in a drill chuck (not included) in the headstock. A 10mm drill bit is needed to complete this project. Wood not included.