Are these suitable for an indoor playground for children? With slides etc.

You can use our 8mm Strong Rubber Rolls - Designer Series as flooring for an indoor playground. If there isn't a concern about a child falling off the equipment due to it being very small, then these rubber floors would work great. They are slip-resistant even when wet and are very easy to clean and maintain. If a fall height is necessary, then we would recommend using one of our playground tiles or rubber mulch. These products have fall height ratings and will help to keep a child from getting seriously injured if they were to fall off any playground equipment while at play.