-Earring hooks are hypoallergenic stainless steel. Comes with a rubber backing
-Charms are made out of heavy duty plastic (NOT shrink plastic). Waterproof and very durable. They have a glossy sheen to them and are scratch resistant. The image is printed on the front. The back is white. Measurements:
Yellow book: 1.5" by 1"
Pink book- 1 1/2" by 1 1/4"