Light transmitting wedges transmit:

Light transmitting wedges As the name indicates, these types of wedges transmit 90 to 95 percent of incident light. They are a type of plastic wedges. Transparent in nature. Designed for use in the cervical area of class II composite resin restoration. Nisha Garg, Amit Garg. Textbook of Operative Dentistry.  Edition 3. Page:209