Jo,
They are kitchen/bath carpets with rubber backing. You will notice various colors if you look at enough of my photos, because we have a bunch of them. I buy whatever is in the discount bin. I keep one set in the box, one set ready to go and one set in the washer... at this age, they have started to pee on the one mat more and sleep on the other, so one stays dry a little longer. They don't stay dry very long, though, so it's almost time for them to come out of the box and to go in the pen with some straw/hay. I like to keep them as clean as possible, so that they are easier to housetrain. I have gone to a little smaller whelping box and it is a little easier to keep clean, which is nice for me. We finally got a dedicated washer and dryer just for dog stuff... again, it is getting easier to keep things clean. I also got the best accessory ever... a therma-whelp. It is a coated pan and a hanging heat element... the pups started to crawl to it when they wanted to warm up when they were just a few days old. This gives a warm corner for the pups that mom can stay out of and there are no electrical cords in the box. I have the hot setup now!!!! Thanks for the kind words about Kelly. She has given us some good stuff and we are very pleased. She has been so happy with this litter, it has been almost funny.
Stace... I was mistaken about the ticking in the puppies. Turns out this guy is his daddy's little boy, for sure. He is the only one that is showing the ticking right now, but I did notice that they all have the same shape to the white on their chest. On some, the full shape is not white, but they have at least the outer ring of white in the shape of an inverted triangle... I haven't seen the consistency of the pattern in our previous pups.