Losi 50T Centre Diff Spur Gear, DBXL E 2.0 BNR32 The included Spektrum SLT2 2 channel Aluminum Differential Case The included Spektrum SLT2 2 channel radio helps you learn control skills safely by limiting maximum speed to 50% or 75% until you’re ready to unleash it all science and dinosaursIncludes digital building instructions – The LEGO® Builder app features a digital version of the building instructions included with this LEGO Icons construction setLEGO® projects for adults – This LEGO Icons project is part of the Modular Buildings series of advanced building sets designed for adultsDimensions – This 4 Teeth: 50T Genuine Losi 50 tooth centre differential spur gear for the 1 5 DBXL E 2