Crystal clear acrylic, ultra lightweight for carry around, plus, easy to read when photo shooting. | Fit with most SLR/DSLR camera (Canon, Nikon, Olympus) with flash mount/ hot shoes. | A must have tool for landscapes and architectural photography, allowing levels positioning of horizontal and vertical axis simultaneously. | Easy to slide into the camera hot shoe; position on the flat part of the camera, exact corresponding to the lens axis. | These Are Not for Minolta & Sony & Nikon D5200, D500, D5100, D90, D7200, D3300, D300, D3200, D7100, D600, D7000 are excluded because of different hot shoe design.