Installation note: These sockets, like most self wire-able metal sockets, come with a cardboard lining inside. This should be left in as it acts as an insulator. Do not remov-e it. Color: Platinum brass / Red brass / Pearl black / Silver / Antique brass / Gold These sockets, like most self wire-able metal sockets, come with a cardboard lining inside. This should be left in as it acts as an insulator, Do not remove it. Easy Install: Cap base has 1/8 IPS standard lamp pipe thread with set screw. Packge Included: 4pcs*light socket. Description: Material:Made of copper and aluminum, the light socket is practical and durable. Light Base: Medium E26/E27 standard base. Power And Voltage: Rated for up to 250 Watts / 250 Volts. Easy Install: Cap base has 1/8 IPS standard lamp pipe thread with set screw. Installation note: These sockets, like most self wire-able metal sockets, come with a cardboard lining inside. This should be left in as it acts as an insulator. Do not remove it. Specification: Material:Copper+Aluminum Size: About 72 x 34mm/2.8 x 1.3inch Base Type: Fit E26/E27 Watts : Up to 250w Color:Black Pearl Packge Included:4pcs x Light Socket Note: 1. Due to the light and screen difference, the item's color may be slightly different from the pictures. 2. Please allow 1-2 cm differences due to manual measurement.