Each mystery pack contains 3 3inch stickers with glossy finish. Each sticker is normally priced at $2 each, so with the packs you are getting 2 stickers at regular price and a 3rd half off. Each of the 3 stickers are chosen at random, no duplicates per pack, but if you buy multiple packs you may get duplicate stickers among them.
Stickers are made from a durable vinyl material. Unless labeled as “water proof” the stickers are resilient to water but I would not recommend they take multiple trips through the dishwasher or will last more than 3 years on a vehicle, however my regular stickers have survived on vehicles for at least 2 years (given climate and use) and can survive hand washing on a water bottle rather long.
Stickers that have the following finishes should not be microwaved. Glitter, Metal Brushed, Mirror or prismatic and holographic.