Integrated circuits can be packaged as DIP (Dual in-line package), PLCC (Plastic leaded chip carrier), TSOP (Thin small-outline package), PQFP (Plastic Quad Flat Pack) and other chip package types. Some small ones are packaged for surface-mount technology. The transistors inside can be bipolar transistors in unusual circuits, such as those needing very high switching speeds. Most, however, are MOSFETs.