Thanks, I will try to have rows of weight[4] and index[4] then, as per your former suggestion. If that case, just to confirm with the following code, I should have a vec4 weight and vec4 index...

I need this in my shader

attribute vec4 weight;
attribute vec4 index;

through this,

glBindBuffer(GL_ARRAY_BUFFER, 0);
glBindBuffer(GL_ARRAY_BUFFER, bufferId);...