Very substantial, Great blocks. But took almost 2 weeks to arrive after I purchased.
I purchased one block to give it a go and have since bought another to make a pair! They are great blocks to practice with and love the sustainability aspect!
These are strong and sturdy yoga blocks. They don't slip beneath you (if you are putting your weight on them) and I am not worried about slipping off of them either. Highly recommend. Wish I bought them sooner!
Perfect weight, great stability and amazing grip.
And it smells good too!!