Spy pen + working pen + engineering pen + magnatic pen + Antenna pen + light pen + laser pointer pen + uv light pen + writing pen 1. yeh pen khulker lamba b ho jata hai. 2. yeh pen magnetic pen hai yeh iron ko carry kr skta hai.. 3. yeh pen likhai padhai karne k b kaam ata hai. 4. yeh pen teaching k liye board per samjhane ke kaam b ata hai. 5.agar pen ki ink khatam ho jaye to aap isme dobara ink b daal skte hain 6. isme 3 cell to already fit hote hain 7. iske sath apko 3 cell free milte hain 8. iske sath ek box milta hai 9. yeh pen engineering work me centering k kaam b ata hai