Two pliable black rubber like cups joined by stretch retainers create a tight moisture proof and dust proof seal to protect your valuable optics while in storage, transit or in the field. Bikini style fits all standard scopes with outside bell diameters. A highly effective lens-protection system and a long time favorite to hunters and shooters. Product Specifications: Brand: Butler Creek Model: 19000 Manufacture Part Number: 19000 Product Weight: 0.2 pounds Approximate Product Dimensions: 1.5" x 3.62" x 5.5" (Length x Width x Height)