Can contact gel 5 L: Product conforms perfectly, I use personally, with an ultrasound device. This gel allows the probe to slide easily. The pros: value very interesting, immediate availability and super fast delivery. The -: pour the gel big bottle in the bottle provided is not a trivial matter, nothing has been provided by the manufacturer ... So I put together a bespoke funnel using the top of a plastic bottle of water (1L), which I cut to aid in filling. And it works ... I highly recommend this product.