Internal Diameter: Adjustable 86-117mm Adjustable caliber for different caliber astronomical telescopes; Safe and fast to observe the ; long life Cautions: 1. 't broken solar filter; 2. 't poor-quality solar filter; 3. 't look directly at the ; 4. 't remove the Baader AstroSolar when observing the ; 5. Never look at the , either directly or through telescopes, otherwise it will permanent damage to eyes if observing the without a professionally made protective solar filter installed completely covers the front of the instrument. size:about 125x125x40mm Material:Plastic+PET+aluminum foil coating colour:Black Package Contents: 1 x Solar film Only the above package content, other products are not included. Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.