Kopfjager Replacement Grip Sleeves Black. The sleeves are crafted out of a durable PVC material and weigh in at just 26 grams. The Replacement Grip Sleeves can also be layered over existing sleeves on Reaper Grips to provide more grip towards smaller diameter rifles. The replacement sleeve is also compatible with Kopfjgers Ambush. Specifications for Kopfjager Replacement Grip Sleeves: Manufacturer: Kopfjager Color: Black Features of Kopfjager Replacement Grip Sleeves Compatible with Reaper Grip and Ambush. Can be layered on Reaper Grip for smaller diameter rifles. Package Contents: Kopfjager Replacement Grip Sleeves Camera thread adapter Kopfjager KJ89004: Replacement Grip Sleeves Black