1[EXCELLENT MATERIALS] The driven rollers are made of TPU rubber, and other parts are made of cold rolled SPCC steel and aluminum, which are resistant to wear and deformation. 2[BEARING DESIGN] Built in dual bearing design, 8pcs small rubber rollers are embedded in a total of 16 miniature bearings, is flexible in movement. 3[BAKING VARNISH] The surface of the product is treated with high temperature baking varnish, which is wear resistant and non adhesive, beautiful and durable. 4[COMPACT SIZE] 3in omni wheel can provide more space for the construction mechanism to assemble other parts to realize more rich functions. 5[FOR ROBOT FIELD] 45 degree omnidirectional wheels, allowing the robot to achieve omni directional motion while supporting larger loads. Item Type: Omnidirectional Wheel Material: SPCC Steel, Rubber Diameter: Approx. 76mm / 3in Wheel Width: Approx. 40.5mm / 1.6in Composition: 8pcs TPU rubber rollers + cold rolled SPCC steel stamping wheel hub Feature: 45 degree omnidirectional wheel Purpose: Suitable for various small accurate applications, especially suitable for driving applications of various small robots 1 x LeftOmni WheelPlease match the appropriate design size before use.