The shell is made of acrylic and plastic.
Pack of 4, level your scope and rifle at the same time.
There is a strong magnet in the bottom for easy, hands-free use.
Every bubble size is 1.5 x 0.6 x 0.6 inch, compact size allows for convenient storage and transport.
Designed for Mounting Optics. Essential for making sure your scope and gun are level to each other.