Roller Figure Skating How Do These Roller Blades Work (figure Skating)?

How do these roller blades work (figure skating)? - roller figure skating

Http: / / www.skatesforless.net / product.php I saw this online ... and wondered how they work. How can I improve my skating shoes and just put them in the blades for coasters blade platform? So you can really figure skating practice, they moved? Are they working well? Are they readily available? Thank you! :]