Feature:1. 16cm Diameter: The wheelchair wheel with 16cm large diameter ensures quick moving with great stability.2. PU Material: Adopting premium PU material, the caster is skidproof and wear resistant during rolling.3. Ball Bearing: Equipped with metal ball bearing, the tire enables smooth rolling and durable using.4. Thickened Hub: Thickened wheel hub is not easy to deform, which also has great load bearing capacity.5. Broad Using: Suits perfectly for wheelchair, walker, rollator and so on, very easy to install as well.Specification:Item Type: Wheelchair Wheel ReplacementMaterial: PU MaterialDiameter: Approx. 16cm / 6.3inTire Thickness: Approx. 30mm / 1.2inWheel Hub Thickness: 53mm / 2.1inBearing Model: 608zzBearing Hole Diameter: Approx. 8mm / 0.3inBearing Outer Diameter: Approx. 22mm / 0.9inBearing Thickness: Approx. 7mm / 0.30in(There may be small error in manual measurement.).Package List:1 x Wheelchair WheelReplacementNote:Please match the appropriate size before use.