Thank you for viewing. This is an item for decluttering. It's a bandpass filter for green to infrared light. I think it can be used for DIY, handmade projects, research, and study. Edmund Optics Bandpass Filter Set of 6 * Individual sales are also possible. ・TS OD 4.0 10nm Bandpass Filter 905nm 25mm (65184) ・TS OD 4.0 10nm Bandpass Filter 940nm 25mm (65185) ・TS OD 4.0 50nm Bandpass Filter 550nm 25mm (84784) ・TS OD 4.0 50nm Bandpass Filter 650nm 25mm (84786) ・TS OD 4.0 50nm Bandpass Filter 750nm 25mm (84788) ・TS OD 4.0 50nm Bandpass Filter 850nm 25mm (84790) Please refer to the manufacturer's official website for detailed specifications. All are Φ=25mm. I don't think there are any noticeable scratches on the surface, but please understand that it has been stored by an amateur before purchasing. edmund TECHSPEC bandpass filter optical equipment lens infrared near infrared camera optics spectroscopy imager