The number is size of the crown. Scope: For Kids. Material:Stainless Steel. 48 Different Sizes Can Be Chose. Sizes with Mm:Allowable error range：±0.3mm. E-LR-2: 9.5×8.7. E-LL-7: 11.8×10.5. E-LL-6: 11.4×10.2.
The number is size of the crown. Scope: For Kids. Material:Stainless Steel. 48 Different Sizes Can Be Chose. Sizes with Mm:Allowable error range：±0.3mm. E-LR-2: 9.5×8.7. E-LL-7: 11.8×10.5. E-LL-6: 11.4×10.2.