To replace the strap simply unscrew 4 flat head screws on the back of the watch and remove the case back cover. Remove the strap and replace it with the new watch strap. Reassemble the watch by screwing back in the 4 flat head screws.
Aggregate watches are designed for daily wear and as such we use corrosion and magnetic resistant grade 316 stainless steel, top grain leather, and sapphire crystal on all of our watches. Our concrete bezel is durable, but not indestructible. However, our patent pending design allows for easy replacement for any damage to our concrete bezel.
Don't see the answer to your question? Ask the project creator directly.