Black wheel that clips onto footplate, comes with various different fittings and attachments.
Source of Item:
CRPS, Fibromyalgia, Hypermobility & Epilepsy
I love my Freewheel as it means I can go off-road and walk the dog. It also makes it a smoother ride, which is great for people like me who live in chronic pain.
Although if you use the wrong fitting you can snap your footplate, which is not helpful!