Mice from Reptiles by Mack
This is the box they come in. You can see it lists them as "Medium Sized Mice." There are 4 mice to a box with a total weight of 52 grams. That comes to about 13 grams per mouse. According to the Munson Chart we would call a 13 gram mouse a "Big Hopper or a Small Weanling." A lot of the stores that sell packaged mice do not list them as the Munson Chart does, rather they keep it simple with Small, Medium, Large and Jumbo. We as the buyers have to use a little common sense and look at the packaged weight and refer to the chart for the proper feeding schedule. I mean, does it really matter what we call the mouse? So long as it's the right size and weight for the snake, who cares if it's a hopper, weanling, or Medium Mouse?