plasticizer was poured into the toys. with which they were infused for 6 days. but apparently it was necessary to knead and turn the toy more often. because the result was uneven. and on the ball in general spots. but despite this, it really felt like latex. and to my delight, the seams withstood the load. since the toys exploded in the most saturated place with the solution. used intex killer whale and polka ball 42"