This RWS Thru Bolt w/Aluminum Lever is the latest version of DT's RWS technology. Where the standard RWS Thru Bolt uses a carbon reinforced plastic lever arm, you'll get a lever made from machined aluminum here. The weight is exactly the same, and you'll perhaps get more durability in the event of a crash with these alloy bits, not to mention the appeal of the more sculpted look.