The pattern uses US terminology. I have used light worsted yarn to crochet the lipstick and a 3.5mm (E-4) hook.
The pattern uses:-
Half - double crochet
Crocheting in the round
In addition to normal crochet supplies you will need a split ring. This is the perfect pattern for using up your stash as the lipstick uses less than 25g of each color.
This pattern would suit someone with an intermediate skill level.
Due to small parts the finished key chain is not suitable for young children.