Material: ABS, Glass Quantity: 2 What's included in the box? -2 x Trailer extension mirrors Our product advantage -Material: Made of high-quality ABS and glass, durable and sturdy -Function: Used to expand the rearview mirror's field of view -Installation: Adjust the rubber strap to fit the rearview mirror and tighten it -Quantity: 2 trailer extension mirrors -Compatibility: Suitable for most cars, trucks, SUVs, RVs, Jeeps, trailers, etc.