MSMA (monosodium methanearsonate) is an arsenic-based grass killer. It kills grassy weeds such as crabgrass and goosegrass without harming most turfgrasses. It contains organic arsenic that, according to the University of Tennessee Extension, is less harmful than aspirin.
There are several styles of hearing aids available, from the smallest - Invisible in the Canal (IIC) to the largest and strongest - Power Behind the Ear (BTE), and the very popular Receiver in the Canal (RIC) - made to fit most hearing losses while remaining nearly unseen.
1 Panasonic's RW-1 Series and 4 Series are open-fit, behind-the-ear (BTE), receiver-in-the canal digital hearing aids that can fit a broad range of hearing-loss profiles. 2  JZ and JZ Power models are body-worn hearing aids with earplugs.