I have not opened these as I purchased as a gift for my nephew, but upon looking at the product it looks to be great quality and should fit Lego brand legos to it. I'm sure my nephew will love these and the fact that it is reusable is great!
#rankboosterreview #sponsored #Shackcom
https://www.amazon.ca/Shackcom-Building-Washable-Multicolor-Baseplate/dp/B0781FB9ZK