2.1-Gram Linear Long-Throw, 38mm Lead This is the Spektrum 2.1g Linear Long Servo with a 38mm Lead.Features:9.1 mm servo throw JST-SHR Connector Performance Micro servo for use with AS3X receivers Compact footprint Single Bearing for friction free operation Replacement servo for Blade Nano MCPXIncludes:One Spektrum 2.1g Linear Long Servo with a 38mm Lead