... :bullet,cylinder,bell 2.NRR: 29db 3.Size:2.5*1.2cm 4.Fast rebound Pu foam ear plug pecification: - ... Material: PU foam- NRR:29db- Size: 2.5*1.2cm- Type: Fast rebound- Quality: meet ANSI S3.19 and ... Colour: orange,yellow,red,blue,white,pink,green,etc- Packing: 1 pair/polybag,5000pair/ctn;or 100 or 200pair in dispenser ... 29db PU foam bullet shape ear plugs size:2.5*1.2cm fast rebound