Once you have a pack of muslins, you shouldn't need to buy any boosters later.
These are solid rocket boosters or SRB for short The SRB are made by Thiokol at their factory at Utah.
Both nurses are trained to give Travel immunisations and tetanus boosters.
Small rocket boosters on each satellite keep them flying in the correct path.
Another thing to keep track of are your child's pre-school boosters.