See through grinders have recently gained a lot of popularity for the very simple reason that you can look inside and find out about how much more you need to work. Avoiding opening it again and again for checking and this avoids spill outs as well. The two chamber acrylic grinder is small and convinient as it comes with a storange chamber as well. This is a well made magenetic grinder which is portable and durable. This one comes in green.