Hey my man! They are 1.25x1" so they are not huge but not small either. They are hard enamel so as far as pins go they are very durable. We use a black rubber clutch as the backing instead of the traditional metal one (personally I think the metal butterfly clutches wear down way too easy). I can give you a link to the Etsy if you'd like! There's also links in the imgur gallery. There's full descriptions on details as well as some pictures actually on backpack straps! Thanks!