RockShox BoXXer Select D2LinearXL air spring delivers a consistent and predictable ride feel backed by a jounce bottom out bumper for end stroke control Delta RC damper with easy to adjust Compression and independent Rebound features intuitive controls and virtually silent performance, keeping riders focused on the trail Low grab SKF wiper seals deliver long lasting fork performance and a smoother ride SRAM Model ID: FS BXR SEL D2 Attributes Brake Type Disc Damping Charger 3.