Here is a box of safety door knobs covers. Each cover comes in 2 halves.  They snap together over the door knobs. 4 covers each box.

Keep your little ones safe with Wittle Door Knob Safety Covers. This set of four unit-type locks is perfect for baby proofing your home. The white color and Wittle brand name ensure your locks are both stylish and reliable.

These safety door knob locks are designed to prevent your child from opening doors without your permission. Each lock is made in China and comes with a unit quantity of four. Keep your babies safe with Wittle Door Knob Safety Covers.