Check the listing for details. API "CHAIN SILENCER" PRE-PUNCHED HEAT SHRINK TUBING. Condition: New. Listed at 29.95 USD. FREE SHIP (2) API TREESTAND CHAIN REPLACEMENT HEAT SHRINK TUBING with pre-punched holes every two inches, same as original. This is very tough tubing, the best we have found after 11 years of API chain cover sales on eBay. (2) API replacement shrink tubing chain covers fits 95% of ALL API self-climbing treestands except the 350lb rated stands (See our other auction for those). You will get 2 lengths of very high quality shrink tubing 67" long, enough to easily cover both chains. All you need to do is to pull the chain into the shrink tubing with wire or string, apply heat, and you’re done. The best way to heat it is with a heat gun but you can use a propane torch or other means. This shrink tubing will fit all API models with #2040 chain (2040 chain has 1" pitch or 1" between links). This number 2040 may be stamped on the inside or outside of links. You will receive easy step by step instructions. We ship everyday. Some people prefer the pre-punched holes so we have decided to offer this item again after a 3 year hiatus. This is the item we offered in the beginning but had switched to punching holes after shrinking. So now we offer both models, pre-punched and W/O holes. You can save some money purchasing our other model W/O holes.