CORE SINCE '54. The Bell Custom 500 helmet is the icon of the 3/4 helmet. With 5 shell sizes the Custom 500 gives the rider a personalized fit regardless of where they fall on the size chart. The soft quilted interior with contrast stitching is enclosed by a composite fiberglass shell. Fit and finish are impeccable and thanks to the dozens of visors and fins available the customization possibilities are endless.