If the building blocks are compatible with ZOOB ? Sorry , it is not . How many wheels does it have ? It comes with 8 piece wheels which support to assamble many different kinds cars, truck ... It is suitable for toddlers below 3 years old to play it ? No, this building toys are for kids above 3-12years old to play ! It is easy to assamble ? Yes, it comes with an ideal booklet , children could build structure according to the booklet , also they could build anything they want ! If it is safety for children ? Yes , all the building blocks passed the safety test ! HUAKER Kids Toys Magnetic Building Toys Buying Options Magnetic Cube Block Buying Options 125PCS Building Toys Add to Cart 180PCS Building Toys Add to Cart Walkie Talkies for Kid Buying Options Customer Reviews 4.5 out of 5 stars 351 4.6 out of 5 stars 41 4.7 out of 5 stars 1,771 4.7 out of 5 stars 1,771 4.3 out of 5 stars 4,564 Price $25.49$25.49 $27.99$27.99 $23.99$23.99 $31.49$31.49 $25.19$25.19 Need Assembled ? Yes Yes Yes Yes No Applicable Age 3 years and up 3 years and up 3 years and up 3 years and up 3 years and up Material Plastic +Magnetic Plastic +Magnetic Plastic Plastic Plastic Washable ? ✔ ✔ ✔ ✔ ✘ Number of Piece 88PCS 66PCS 125PCS 180PCS 3PCS