I believe they're plastic, definiatly NOT metal, as for scraches, some. Little ones not noticable if worn - but if for collecting... 1 3/8" long & 3/4" wide, as far as shipping, that depends how you;d like it shipped. By itself in an envelope, maybe one stamp- Although this'll be my frist mailing of earrings (with posts that could bend..) so i have bubble wrap, but if your uncomfortable with that please suggest.. (MAX - 2 STAMPS)