Modern Aquarium Algae Scraper (sizes from 10" to 16")

I actually purchased both the 10" and 16" sizes. These are solid tools. You will need to purchase your own blades to use with these tools. And they both take different size blades. The 10 " takes regular sized razor blades which already had on hand. I am not sure what size blade the 16", all I know is that it takes a larger and longer blade. I wish the description was a bit more descriptive. While purchasing, I assumed both the sizes take the same blade size, but they do not. As of this review, I have only used the 10" algae scraper and it works great.