Also refered to as the Clow Book, it was created by Clow Reed and it held all the magical Clow Cards inside. The Clow is locked with a magical seal and only the choosen one had the power to open the book. The Clow Book was stored inside Aiden Avalon's library, where Sakura accidentally released every Clow Card (except The Windy) when she summoned The Windy card by accident.

Clow Cards
These are the magical cards that were released when they were blown away by The Windy card. The card form is really just the Clow Card when they are sealed. Each Clow Card may be summoned just by the call of their masters. But in the show Sakura uses a Sealing Wand to do the job.

Magic Key
This is what Sakura wears around her neck and it can be tranformed into the Sealing Wand if she needs it to capture a Card.

Sealing Wand
The wand is used to either summon a Clow Card from it's card form. It can also be used to return a Clow Card back into the sealed form of a card.

Lasin Board
Using the powers of all the Clow Card elements, Li Showron is able to seek out the location of the Clow Cards with this Lasin Board.

Magic Sword
This is what Li uses to battle Clow Cards. He may use it to summon his Clow Cards or he may use it in battle by releasing what he calls, "LIGHTNING".

Ofudas
Li Showron uses these ofudas (cards or paper) to cast spells such as fire. Sometimes he will use these against Clow Cards, but sometimes he will even use it on humans. Like on Episode US#4, Double Edged Blade, he used it on Tori.