Probes or depth charges. Of course they are not supposed to all go in. That is not the point. Assume the relevant position, insert the probe, and start sliding it in and out at leisure. As long as the probe diameter exceeds 40 mm, all that matters is length. For serious riding shorter probes are preferable. For kneeling positions, a very long probe is necessary. Armadillo is a simple, ringed wand, a wider equivalent of the beginner-friendlyRed Ringer . Topped by a tapered spade, it consists of further 7 rings, progressively increasing in diameter from 56 mm to 67 mm. The base is sturdy and easy to hold, even though the length of this wand will require stretching the arm substantially during insertion. Bottoming out on this wand is unlikely for most humans under 2 meters tall, but the rings guarantee satisfaction. Being insatiable as per usual, I wish the Armadillo was a quarter shorter, and up to 5 mm wider. Yes, I always want more ;) Entry: ----------------- The entry is facilitated by the top spade, the base of which reaches a gentle 47 mm. That is still within the upper small range, and therefore the Armadillo can be used as a warmup toy. Or could have been, if it were any shorter, so that insertors didn't have too stretch their arm so far. Still, if the wand is securely gripped above the base, on the bottom rings, the length shouldn't be a problem. There are 5 thickish rings after the spade, more or less equal in length, and progressing gently in diameter, at 56, 59, 61, 64, 66 mm, respectively. The two bottom rings at 67 mm are not reachable due to the length of the wand. In order to insert them as well, organic players would have to penetrate their sigmoid colon, which requires soft material and a very slow operation. Play: ----------------- Therefore, thrusting this toy will get one to 64 mm, or 66 if said thrust is bold and the fifth ring goes in, which in most cases it doesn't. It is not worth fighting for this last milimeter, and for best results, I recommend the first four rings. The speed of action can be then adjusted upwards, depending on the mood of the day. This is exactly my preferred mode of operation: hold it by the base, take the spade and the first five rings in, and when things get hot, change the grip to hold both the base and the bottom rings, and increase the speed. Materials: ----------------- The material is on the soft side, and thus very much thrust-friendly -- even though as a whole this wand is heavy, and very, very sturdy. There is no worry that it will bend this way and that. This isn't hard and unforgiving high-friction silicone either, and hence the operation will be slick and smooth. A thin coating ofsilicone bodyglide is enough to lubricate the Armadillo, although due to the substantial surface area, I recommend to relubricate it after the initial insertion with a layer of water-based lube. Once the rectum is well-oiled, the waterlube will not dry up as fast.