Different types of racket grommets

Dear BCMembers,

Few questions regarding racket grommets,

1. How many types are there? (Ø x Length).

2. Where to buy online these types of grommets? (Asia & preferably the smallest Ø size, Length doesn't really matter)

3. Is www.mybadmintonstore.com trustworthy enough (price of badminton accessories is quite expensive)?


Thank you for any responses.