The Bolli is a lightweight silicone ball, perfect for little hands to grasp and explore. Its easy for babies to stretch and squish which makes it great for sensory play. It is thin enough for infants to grasp easily, yet chunky enough to have some substance so that their manual dexterity gets a workout as well. Parents liked the fact that OgoSport made Bolli out of a soft silicon material, so that when their babies flail their hands around with the ball gripped in their fingers they didnt have to worry about it hurting them if it hits their face. As with most toys for this age group, this toy generally ends up in babys mouth, again no problem thanks to the materials and thoughtful design. Speaking of design, teething babies will love the feel of this against their gums. Bolli is very easy to clean in hot soapy water and it dries quickly. The colors we tested were all nice and bright which helps to keep any babys attention. The price point is superb making this a big winner with our testers.