This series of products are our main machining products, applicable as the matching parts of knife switches, with full range of models. Their original materials are 3021 phenolic paper laminate and 3240 epoxy glass cloth laminate. This series of products, being the best in product property and most complete in varieties, is one of the series of products which own large market share. Except for general models, the products can be made according to the request of customers.