Amazon.com: Yomega Power Brain XP yoyo - Professional yoyo with a Smart Switch which enables Players to Choose Between Auto-Return and Manual Styles of Play. + Extra 2 Strings & 3 Month
3 Ways to Make a Yoyo Sleep - wikiHow
Amazon.com: Duncan Toys Butterfly Yo-Yo, Beginner Yo-Yo with String, Steel Axle and Plastic Body, Mystery Color : Toysmith: Toys & Games
Amazon.com: Yoyo King Blue Everloop Professional Looping 2A Trick Yoyo with Ball Bearing Long Spin Axle and Extra String : Toys & Games
3 Ways to Make a Yoyo Sleep - wikiHow
3 Ways to Make a Yoyo Sleep - wikiHow
Amazon.com: Duncan Toys Hornet Pro Looping Yo-Yo with String, Ball Bearing Axle and Plastic Body, Mystery Color : Toys & Games
YoyoFactory Velocity yoyo
3 Ways to Make a Yoyo Sleep - wikiHow
How to Put a String on a Yoyo and Adjust it for Play | YoYoTricks.com
3 Ways to Make a Yoyo Sleep - wikiHow
TOP YO Creater V2 Yo-Yo - Long Spin Sleep Time - Metal YoYo| YoYoSam
3 Ways to Make a Yoyo Sleep - wikiHow
Yo-yo - Wikipedia
3 Ways to Make a Yoyo Sleep - wikiHow
newtonian mechanics - Why does a Yo-Yo sleep, and then awaken? - Physics Stack Exchange