These scratch labels are very common in the market. We use these on a lot of things, such as :
Prepaid Calling Cards
Prepaid Top Up Cards used to re-fill the mobile phone balance
Pre-paid Gift Cards for promoting businesses
Lucky Draw Coupons Raffles Tickets during Bazaars in schools, colleges and other places during campaigns and festival times
Membership Cards to activate the membership with a unique password
Debit Card ATM Pins
Bank Documents
High Security Purposes