With the Mask MF Flip Frame—now available in blue in addition to red, black and grey—offers optional corrective lenses from +1 to +8 in 0.5 increments. The external flip frame can be magnetically attached to a dive mask, once it is detached from the flip mechanism on the mask frame. Made from anodised aluminium, the mask frame and flip frame have a .25-inch thread at the corners for attaching small accessories such as an action camera or dive light.