This durable board is constructed to withstand consistent breaking with a tongue and groove design that slides the two pieces of the board easily back together. Both sides have foam covered striking areas. Available in four different colors, each with a different strength level. Each sold separately. Imported Yellow - Beginner: 0.7 cm thick Blue - Intermediate: 0.8 cm thick Red - Advanced: 1 cm thick Black - Expert: 1.5 cm thick