TPR, shaped simply and textured inside with a 3D moulding rather than a plain tunnel. It warms through use and stretches to fit, holding pressure as it goes. Nothing about it needs setting up — this is the manual end of the shelf, where the appeal is precisely that there is nothing to learn or to charge.
Use a water-based lubricant, because oil-based and silicone-based formulas both attack a TPR surface.
Warm water with a little neutral soap, then a thorough dry, is the whole of it. Stored against other soft toys it picks up marks, so give it a spot of its own.
