Fishy- Check your laws first before you set any traps. For muskrat the #110 or 120 conibear (body gripping traps) Are the most widely use. For beaver I use #4 or bigger leg hold (steel traps) with a drowning set. 220 or 330 coni. can be used for beaver also. In MD. steel traps larger than 5 3/4" when open and coni. larger then 8" when open have to be completely submerged in water. Your laws may be different.