1. Material: ABS, glass lens (110mm is acrylic lens)2. Uses: student observation, elderly reading, maintenance, etc.3. Effective diameter: about 75/90/110mm4. Multiple: 6 times of 75mm, 5 times of 90mm, 2/13 times of 110mm5. Size: 75mm about 20.3x8 cm/piece, 90mm about 21.7x9.4 cm/piece, 110mm about 23.5x11.5 cm/piece6. Weight: about 104g/piece for 75mm, 149g/piece for 90mm, 118g/piece for 100mm

http://olla.gr/2-pcs-children-science-education-elderly-reading-hand-held-magnifying-glass-specification-110mm/