Choose between Classic and 3D Granite fiberglass shells to match your preferred look. Classic shells feature a smooth, single-color finish with one UV-protective gelcoat layer, while 3D Granite shells have a two-layer gelcoat finish with high UV resistance and a speckled, granite-inspired appearance that adds visual depth. Both finishes are available in four colors for Ofuro, Quadro, and Ø200 cm and XL hot tubs with external or integrated heaters.