Thread: is this routine enough?

I want to know if my routine is alright, let me know what you think. I'm trying to bulk up a little. I do about 4 exercises per body part 3-4 sets between 6-10 reps. I vary exercises so I dont always do the same thing:

day 1 shoulders/abs
day 2 legs
day 3 chest/back
day 4 off

Any critiques and suggestions will be appreciated. Thanks.

I usually keep things pretty simple:

chest; either db or barbell bench
incline db press
dips
flys db or pulley station
back; pull ups wide grip and close grip
pull downs
seated row
romanian deadlift
shoulders; military press db or barbell
upright row
lateral raises
front raises
arms ( I forgot this in my first post befor my off day);
preacher barbell curl
preacher dumbell curl
hammer curl
seated alternating curl
skull crushers
kickbacks
pushdowns
rope pushdowns

legs; squat
sled
leg extension, single leg alternating
hamstring curl
for calves i do the stairmaster on my tip toes

its not always the same i change things here and there always between 6-12 reps and i make sure the last rep is the absolute last one i can do with out sacrificing form. Cardio; 20 min a day 3 days a week