Rollerblade TFS Micro junior,
    This soft and supportive extendible skates with an innovative closure    
    system, specially designed to grow with children’s feet so new skates
    are not needed as often. The TFS closure system allows the skater to 
    adjust the fit with the twist of a dial, thus removing the need to tie 
    laces. These are extendible in length up to size US7.

Features include:
LINER: Specially padded liner designed to adapt to the shape of a child’s foot featuring elastic material in the toe area in order to accommodate growing feet, and a footbed specifically researched and suited for children.

WHEELS: 4 wheels 72 mm/80A sizes 22.5–25.5,
4 wheels 72 mm/80A sizes 20.5–23.5,
3 wheels 72 mm/80A sizes 18.5–21.5

BEARINGS: Abec 3