our roofing slate product confirms to ASTM C406 S1, EN12326 and BS680 Standards. Roofing slate Size: 600x300, 600x450, 500x250, 500x375, 400x250, 400x300, 400x200Thickness: 5-7mm, 6-8mmColor: Jade green and purplePacking: In wooden cratesDelivery time: about 15-25 days for 1x20'fcl"Minimum order quantity: One 1x20'fcl"