1. Material: ABS glass lens (110mm is acrylic lens)
2. Uses: student observation elderly reading maintenance etc.
3. Effective diameter: about 75/90/110mm
4. Multiple: 6 times of 75mm 5 times of 90mm 2/13 times of 110mm
5. Size: 75mm about 20.3x8 cm/piece 90mm about 21.7x9.4 cm/piece 110mm about 23.5x11.5 cm/piece
6. Weight: about 104g/piece for 75mm 149g/piece for 90mm 118g/piece for 100mm
