Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Very well written book

Sai, karate weapon of self defence is a very well setup book with many images with about 8 for just flipping the sai, with many different attacks and defences for attackers with other weapons such as the nunchaku, or the bo it is an interesting book for the novice or the advanced sai user.the only problem i have with the book is that it does not contain any sai kata. just short excersices of 10-15 different moves.