Keep your glass free from dust and scratches with Monstrum Bikini Lens Covers! The flexible bikini covers secure snugly across the length of your red dot, protecting your glass from the harsh elements when not in use. Compatible with 1x20 form factor red dots for long guns such as the Monstrum Ghost, Sig Romeo5, Bushnell Trophy TRS-25, Holosun 403/503/515 and others. Not compatible with other form factor red dots. All Monstrum products are backed by a lifetime guarantee.