The Defendable is a thick Sleeve Made By Comp Lyfe To Simply DEFEND your Able! These Sleeves Are Made Of The Finest Aluminum On The Market. The Sleeve Itself Is Threaded On The Bottom Portion To Allow The Able To Be Placed Inside. Sleeve Maintenance Keep oil on sleeve threads. Just like your mod, it keeps the threads in good condition and from seizing up. Recommended oil type: 3 in 1 oil.