These Cutting Blocks are very durable, the surface have a non-toxic poly wax finish. Just wipe or lightly wash after use. To restore the patina on the edge of the block, rewax with a good antique wax. Being a large end-grain block of natural timer, shrinkage will always be a factor. Some minor cracking may naturally occur. If the steel band becomes loose it can be simply tightened by the nut at the joint.
The block should never be left in hot situations e.g sun, on or too near cooking elements; this can cause severe shrinking and cracking.