Roller Blade Chair Caster Wheels (5 Piece Set) Roller blade chair caster wheels offer excellent performance, design, and versatility. 3" clear soft treads help protect hard floor surfaces. Ball bearing axels/pivots. Please view all pictures for better detail of dimensions and style. Brand new fresh from factory. Sold in complete sets of 5 pieces. Please double check your stem measurements before ordering. See full product description below.