Constructed from aluminium and steel - for use with 100mm filters fitted with H&Y Magnetic filter framesMade exclusively to fit Fujifilm 8-16mm lens without adapter ringsSlim design enables two 100mm filters to be magnetically attached without vignettingRequires filters to be fitted with H&Y magnetic filter frames available in 100x150mm and 100x100mm sizesSoft foam closure lined clamp to lens barrel, and felt gasket to facia to minimise light intrusion