Bathroom Cladding 5mm Black Diamond Stone Wall Panels & Ceiling Panels AKA Black Sparkle. Tongue and Grooved Ideal for your bath/shower walls going over tiles and on your ceiling 100% waterproof :
White Sparkle Shower Wall Panel | Igloo Surfaces
Cascade Black Sparkle Shower Panels | The Panel Company
10mm Platinum White Sparkle Shower Panel | EASY PANELS
Large Grey Sparkle Shower Panel - 2400 x 1000 x 10mm