The marbles included in the Lost My Marbles Bag of 40 marbles are smooth and well made. There was only 1 broken regular-sized marble in the bag but the rest came with no chips/breaks.
Playing with marbles provides hours of fun with no batteries needed. My daughters loved playing with these and I'm glad that they can take a break from all the tech-y toys and games while playing with these marbles.
Here is a short video review I made of the Bag of 40 Marbles from Lost My Marbles:
You can purchase the Lost My Marbles Bag of 40 Marbles HERE.