Fukiya (Blowgun) Arrow protection tubes. Handmade: Paper product 5 pieces of the same color per set, 4 sets total. The length of the protection tubes is consistent within each set. Please refer to the photo of the arrow inserted for length. The recommended point is Length! Commercially available products are made of plastic and are short, so you tend to push the arrow in, which widens the mouth of the arrow. (It widens even with the weight of storage without pushing it in) Effective in preventing this. I had a failure during a match where the mouth of the arrow was widened and it got caught, causing it to fly off in a completely unexpected direction.