Are there any reusable chips you guys can recommend that works with the M7E board?
not sure what you expect as/of or from re-usable chips. You can re-program many of the chips with a new EPC or user memory. Can you explain a little what you are looking for?
Yeah i guess i was somewhat in my own head when asking the question 
I’m making a timing system for races (run and cycle) and I would like some form of chip that are “casted” into a case like this - but I’m unsure what to look for specifically
I’d use ‘molded’ for the plastic ones in the photo.
For your athletic application, you might add terms like wearable or washable or water resistant as shorthand for a lot of what you’re after.
Yeah its more the technical specifications I’m unsure of 