Rotary Cutter blades are extremely sharp, and should be handled with great care.

Retract blade fully when not in use.
Store in a suitable container.
Keep out of reach of children.

How to Maintain Your Cutting Board.

Keep mat out of direct sunlight and heat.
Store mat flat - do not roll.
Cut in different positions to extend the life of the mat.
Clean regularly - use a "Mat Smoother" and a "Lint Magnet".