DEYACE Dog Collar, Quick Release Metal Buckle Reflective Thick Neoprene Comfort Padded Nylon Dog Collar

Train with or without plastic tips? Without tips on is it painful when correcting dog?

My rescue dog is strong and aggressive, and lunges at other animals. Is it possible for the prongs to puncture him?

Are the prongs easy to open and close?

Can't it be used for a long time?