This is a Butler Creek Scope Cover known as the Bikini, model 19000.
The Bikini(R) Scope Cover protects optics with objectives up to 62mm in diameter. The simple" one-piece design features stretch retainers that hold two rubber caps firm against either end of the scope" providing a dust-proof" moisture-proof seal.
Features:
One-piece design
Ideal for storage transport and field use
